Paginate issues within board list

Update fetching of issues in GraphQL to paginate issues in lists

app/assets/javascripts/boards/boards_util.js

@@ -17,9 +17,15 @@ export function formatIssue(issue) {
 
 export function formatListIssues(listIssues) {
   const issues = {};
+  let listIssuesCount;
 
   const listData = listIssues.nodes.reduce((map, list) => {
-    const sortedIssues = sortBy(list.issues.nodes, 'relativePosition');
+    listIssuesCount = list.issues.count;
+    let sortedIssues = list.issues.edges.map(issueNode => ({
+      ...issueNode.node,
+    }));
+    sortedIssues = sortBy(sortedIssues, 'relativePosition');
+
     return {
       ...map,
       [list.id]: sortedIssues.map(i => {
@@ -39,7 +45,17 @@ export function formatListIssues(listIssues) {
     };
   }, {});
 
-  return { listData, issues };
+  return { listData, issues, listIssuesCount };
+}
+
+export function formatListsPageInfo(lists) {
+  const listData = lists.nodes.reduce((map, list) => {
+    return {
+      ...map,
+      [list.id]: list.issues.pageInfo,
+    };
+  }, {});
+  return listData;
 }
 
 export function fullBoardId(boardId) {

app/assets/javascripts/boards/components/board_column.vue

@@ -7,6 +7,7 @@ import Tooltip from '~/vue_shared/directives/tooltip';
 import EmptyComponent from '~/vue_shared/components/empty_component';
 import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import BoardList from './board_list.vue';
+import BoardListNew from './board_list_new.vue';
 import boardsStore from '../stores/boards_store';
 import eventHub from '../eventhub';
 import { getBoardSortableDefaultOptions, sortableEnd } from '../mixins/sortable_default_options';
@@ -16,7 +17,7 @@ export default {
   components: {
     BoardPromotionState: EmptyComponent,
     BoardListHeader,
-    BoardList,
+    BoardList: gon.features?.graphqlBoardLists ? BoardListNew : BoardList,
   },
   directives: {
     Tooltip,
@@ -72,7 +73,7 @@ export default {
     filter: {
       handler() {
         if (this.shouldFetchIssues) {
-          this.fetchIssuesForList(this.list.id);
+          this.fetchIssuesForList({ listId: this.list.id });
         } else {
           this.list.page = 1;
           this.list.getIssues(true).catch(() => {
@@ -85,7 +86,7 @@ export default {
   },
   mounted() {
     if (this.shouldFetchIssues) {
-      this.fetchIssuesForList(this.list.id);
+      this.fetchIssuesForList({ listId: this.list.id });
     }
 
     const instance = this;
@@ -144,7 +145,6 @@ export default {
         :disabled="disabled"
         :issues="listIssues"
         :list="list"
-        :loading="list.loading"
       />
 
       <!-- Will be only available in EE -->

app/assets/javascripts/boards/components/board_list.vue

@@ -14,6 +14,8 @@ import {
   sortableEnd,
 } from '../mixins/sortable_default_options';
 
+// This component is being replaced in favor of './board_list_new.vue' for GraphQL boards
+
 if (gon.features && gon.features.multiSelectBoard) {
   Sortable.mount(new MultiDrag());
 }
@@ -39,10 +41,6 @@ export default {
       type: Array,
       required: true,
     },
-    loading: {
-      type: Boolean,
-      required: true,
-    },
   },
   data() {
     return {
@@ -62,6 +60,9 @@ export default {
     issuesSizeExceedsMax() {
       return this.list.maxIssueCount > 0 && this.list.issuesSize > this.list.maxIssueCount;
     },
+    loading() {
+      return this.list.loading;
+    },
   },
   watch: {
     filters: {
@@ -72,7 +73,6 @@ export default {
       deep: true,
     },
     issues() {
-      if (this.glFeatures.graphqlBoardLists) return;
       this.$nextTick(() => {
         if (
           this.scrollHeight() <= this.listHeight() &&
@@ -98,6 +98,8 @@ export default {
     eventHub.$on(`scroll-board-list-${this.list.id}`, this.scrollToTop);
   },
   mounted() {
+    // TODO: Use Draggable in ./board_list_new.vue to drag & drop issue
+    // https://gitlab.com/gitlab-org/gitlab/-/issues/218164
     const multiSelectOpts = {};
     if (gon.features && gon.features.multiSelectBoard) {
       multiSelectOpts.multiDrag = true;
@@ -403,8 +405,6 @@ export default {
       this.showIssueForm = !this.showIssueForm;
     },
     onScroll() {
-      if (this.glFeatures.graphqlBoardLists) return;
-
       if (!this.list.loadingMore && this.scrollTop() > this.scrollHeight() - this.scrollOffset) {
         this.loadNextPage();
       }

app/assets/javascripts/boards/components/board_list_header.vue

@@ -176,7 +176,6 @@ export default {
   <header
     :class="{
       'has-border': list.label && list.label.color,
-      'gl-relative': list.isExpanded,
       'gl-h-full': !list.isExpanded,
       'board-inner gl-rounded-top-left-base gl-rounded-top-right-base': isSwimlanesHeader,
     }"

app/assets/javascripts/boards/components/board_list_new.vue

+<script>
+import { mapActions, mapState } from 'vuex';
+import { GlLoadingIcon } from '@gitlab/ui';
+import BoardNewIssue from './board_new_issue.vue';
+import BoardCard from './board_card.vue';
+import eventHub from '../eventhub';
+import boardsStore from '../stores/boards_store';
+import { sprintf, __ } from '~/locale';
+import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
+
+export default {
+  name: 'BoardList',
+  components: {
+    BoardCard,
+    BoardNewIssue,
+    GlLoadingIcon,
+  },
+  mixins: [glFeatureFlagMixin()],
+  props: {
+    disabled: {
+      type: Boolean,
+      required: true,
+    },
+    list: {
+      type: Object,
+      required: true,
+    },
+    issues: {
+      type: Array,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      scrollOffset: 250,
+      filters: boardsStore.state.filters,
+      showCount: false,
+      showIssueForm: false,
+    };
+  },
+  computed: {
+    ...mapState(['pageInfoByListId', 'listsFlags']),
+    paginatedIssueText() {
+      return sprintf(__('Showing %{pageSize} of %{total} issues'), {
+        pageSize: this.issues.length,
+        total: this.list.issuesSize,
+      });
+    },
+    issuesSizeExceedsMax() {
+      return this.list.maxIssueCount > 0 && this.list.issuesSize > this.list.maxIssueCount;
+    },
+    hasNextPage() {
+      return this.pageInfoByListId[this.list.id].hasNextPage;
+    },
+    loading() {
+      return this.listsFlags[this.list.id]?.isLoading;
+    },
+  },
+  watch: {
+    filters: {
+      handler() {
+        this.list.loadingMore = false;
+        this.$refs.list.scrollTop = 0;
+      },
+      deep: true,
+    },
+    issues() {
+      this.$nextTick(() => {
+        this.showCount = this.scrollHeight() > Math.ceil(this.listHeight());
+      });
+    },
+  },
+  created() {
+    eventHub.$on(`toggle-issue-form-${this.list.id}`, this.toggleForm);
+    eventHub.$on(`scroll-board-list-${this.list.id}`, this.scrollToTop);
+  },
+  mounted() {
+    // Scroll event on list to load more
+    this.$refs.list.addEventListener('scroll', this.onScroll);
+  },
+  beforeDestroy() {
+    eventHub.$off(`toggle-issue-form-${this.list.id}`, this.toggleForm);
+    eventHub.$off(`scroll-board-list-${this.list.id}`, this.scrollToTop);
+    this.$refs.list.removeEventListener('scroll', this.onScroll);
+  },
+  methods: {
+    ...mapActions(['fetchIssuesForList']),
+    listHeight() {
+      return this.$refs.list.getBoundingClientRect().height;
+    },
+    scrollHeight() {
+      return this.$refs.list.scrollHeight;
+    },
+    scrollTop() {
+      return this.$refs.list.scrollTop + this.listHeight();
+    },
+    scrollToTop() {
+      this.$refs.list.scrollTop = 0;
+    },
+    loadNextPage() {
+      const loadingDone = () => {
+        this.list.loadingMore = false;
+      };
+      this.list.loadingMore = true;
+      this.fetchIssuesForList({ listId: this.list.id, fetchNext: true })
+        .then(loadingDone)
+        .catch(loadingDone);
+    },
+    toggleForm() {
+      this.showIssueForm = !this.showIssueForm;
+    },
+    onScroll() {
+      window.requestAnimationFrame(() => {
+        if (
+          !this.list.loadingMore &&
+          this.scrollTop() > this.scrollHeight() - this.scrollOffset &&
+          this.hasNextPage
+        ) {
+          this.loadNextPage();
+        }
+      });
+    },
+  },
+};
+</script>
+
+<template>
+  <div
+    v-show="list.isExpanded"
+    class="board-list-component gl-relative gl-h-full gl-display-flex gl-flex-direction-column"
+    data-qa-selector="board_list_cards_area"
+  >
+    <div
+      v-if="loading"
+      class="gl-mt-4 gl-text-center"
+      :aria-label="__('Loading issues')"
+      data-testid="board_list_loading"
+    >
+      <gl-loading-icon />
+    </div>
+    <board-new-issue v-if="list.type !== 'closed' && showIssueForm" :list="list" />
+    <ul
+      v-show="!loading"
+      ref="list"
+      :data-board="list.id"
+      :data-board-type="list.type"
+      :class="{ 'bg-danger-100': issuesSizeExceedsMax }"
+      class="board-list gl-w-full gl-h-full gl-list-style-none gl-mb-0 gl-p-2 js-board-list"
+    >
+      <board-card
+        v-for="(issue, index) in issues"
+        ref="issue"
+        :key="issue.id"
+        :index="index"
+        :list="list"
+        :issue="issue"
+        :disabled="disabled"
+      />
+      <li v-if="showCount" class="board-list-count gl-text-center" data-issue-id="-1">
+        <gl-loading-icon v-show="list.loadingMore" label="Loading more issues" />
+        <span v-if="issues.length === list.issuesSize">{{ __('Showing all issues') }}</span>
+        <span v-else>{{ paginatedIssueText }}</span>
+      </li>
+    </ul>
+  </div>
+</template>

app/assets/javascripts/boards/index.js

@@ -161,6 +161,7 @@ export default () => {
         'fetchEpicsSwimlanes',
         'resetIssues',
         'resetEpics',
+        'fetchLists',
       ]),
       initialBoardLoad() {
         boardsStore
@@ -183,7 +184,10 @@ export default () => {
         this.setFilters(convertObjectPropsToCamelCase(urlParamsToObject(window.location.search)));
         if (gon.features.boardsWithSwimlanes && this.isShowingEpicsSwimlanes) {
           this.resetEpics();
-          this.fetchEpicsSwimlanes({ withLists: false });
+          this.resetIssues();
+          this.fetchEpicsSwimlanes({});
+        } else if (gon.features.graphqlBoardLists && !this.isShowingEpicsSwimlanes) {
+          this.fetchLists();
           this.resetIssues();
         }
       },

app/assets/javascripts/boards/queries/board_lists.query.graphql

+#import "ee_else_ce/boards/queries/board_list.fragment.graphql"
+
+query ListIssues(
+  $fullPath: ID!
+  $boardId: ID!
+  $filters: BoardIssueInput
+  $isGroup: Boolean = false
+  $isProject: Boolean = false
+) {
+  group(fullPath: $fullPath) @include(if: $isGroup) {
+    board(id: $boardId) {
+      lists(issueFilters: $filters) {
+        nodes {
+          ...BoardListFragment
+        }
+      }
+    }
+  }
+  project(fullPath: $fullPath) @include(if: $isProject) {
+    board(id: $boardId) {
+      lists(issueFilters: $filters) {
+        nodes {
+          ...BoardListFragment
+        }
+      }
+    }
+  }
+}

app/assets/javascripts/boards/queries/group_board.query.graphql

-#import "ee_else_ce/boards/queries/board_list.fragment.graphql"
-
-query GroupBoard($fullPath: ID!, $boardId: ID!) {
-  group(fullPath: $fullPath) {
-    board(id: $boardId) {
-      lists {
-        nodes {
-          ...BoardListFragment
-        }
-      }
-    }
-  }
-}

app/assets/javascripts/boards/queries/lists_issues.query.graphql

@@ -7,17 +7,26 @@ query ListIssues(
   $filters: BoardIssueInput
   $isGroup: Boolean = false
   $isProject: Boolean = false
+  $after: String
+  $first: Int
 ) {
   group(fullPath: $fullPath) @include(if: $isGroup) {
     board(id: $boardId) {
       lists(id: $id) {
         nodes {
           id
-          issues(filters: $filters) {
-            nodes {
+          issues(first: $first, filters: $filters, after: $after) {
+            count
+            edges {
+              node {
                 ...IssueNode
               }
             }
+            pageInfo {
+              endCursor
+              hasNextPage
+            }
+          }
         }
       }
     }
@@ -27,11 +36,18 @@ query ListIssues(
       lists(id: $id) {
         nodes {
           id
-          issues(filters: $filters) {
-            nodes {
+          issues(first: $first, filters: $filters, after: $after) {
+            count
+            edges {
+              node {
                 ...IssueNode
               }
             }
+            pageInfo {
+              endCursor
+              hasNextPage
+            }
+          }
         }
       }
     }

app/assets/javascripts/boards/queries/project_board.query.graphql

-#import "ee_else_ce/boards/queries/board_list.fragment.graphql"
-
-query ProjectBoard($fullPath: ID!, $boardId: ID!) {
-  project(fullPath: $fullPath) {
-    board(id: $boardId) {
-      lists {
-        nodes {
-          ...BoardListFragment
-        }
-      }
-    }
-  }
-}

app/assets/javascripts/boards/stores/actions.js

@@ -3,16 +3,15 @@ import { sortBy, pick } from 'lodash';
 import createFlash from '~/flash';
 import { __ } from '~/locale';
 import { parseBoolean } from '~/lib/utils/common_utils';
-import createDefaultClient from '~/lib/graphql';
+import createGqClient, { fetchPolicies } from '~/lib/graphql';
 import { getIdFromGraphQLId } from '~/graphql_shared/utils';
 import { BoardType, ListType, inactiveId } from '~/boards/constants';
 import * as types from './mutation_types';
-import { formatListIssues, fullBoardId } from '../boards_util';
+import { formatListIssues, fullBoardId, formatListsPageInfo } from '../boards_util';
 import boardStore from '~/boards/stores/boards_store';
 
 import listsIssuesQuery from '../queries/lists_issues.query.graphql';
-import projectBoardQuery from '../queries/project_board.query.graphql';
-import groupBoardQuery from '../queries/group_board.query.graphql';
+import boardListsQuery from '../queries/board_lists.query.graphql';
 import createBoardListMutation from '../queries/board_list_create.mutation.graphql';
 import updateBoardListMutation from '../queries/board_list_update.mutation.graphql';
 import issueMoveListMutation from '../queries/issue_move_list.mutation.graphql';
@@ -22,7 +21,12 @@ const notImplemented = () => {
   throw new Error('Not implemented!');
 };
 
-export const gqlClient = createDefaultClient();
+export const gqlClient = createGqClient(
+  {},
+  {
+    fetchPolicy: fetchPolicies.NO_CACHE,
+  },
+);
 
 export default {
   setInitialBoardData: ({ commit }, data) => {
@@ -50,27 +54,20 @@ export default {
   },
 
   fetchLists: ({ commit, state, dispatch }) => {
-    const { endpoints, boardType } = state;
+    const { endpoints, boardType, filterParams } = state;
     const { fullPath, boardId } = endpoints;
 
-    let query;
-    if (boardType === BoardType.group) {
-      query = groupBoardQuery;
-    } else if (boardType === BoardType.project) {
-      query = projectBoardQuery;
-    } else {
-      createFlash(__('Invalid board'));
-      return Promise.reject();
-    }
-
     const variables = {
       fullPath,
       boardId: fullBoardId(boardId),
+      filters: filterParams,
+      isGroup: boardType === BoardType.group,
+      isProject: boardType === BoardType.project,
     };
 
     return gqlClient
       .query({
-        query,
+        query: boardListsQuery,
         variables,
       })
       .then(({ data }) => {
@@ -197,7 +194,9 @@ export default {
     notImplemented();
   },
 
-  fetchIssuesForList: ({ state, commit }, listId) => {
+  fetchIssuesForList: ({ state, commit }, { listId, fetchNext = false }) => {
+    commit(types.REQUEST_ISSUES_FOR_LIST, { listId, fetchNext });
+
     const { endpoints, boardType, filterParams } = state;
     const { fullPath, boardId } = endpoints;
 
@@ -208,6 +207,8 @@ export default {
       filters: filterParams,
       isGroup: boardType === BoardType.group,
       isProject: boardType === BoardType.project,
+      first: 20,
+      after: fetchNext ? state.pageInfoByListId[listId].endCursor : undefined,
     };
 
     return gqlClient
@@ -221,7 +222,8 @@ export default {
       .then(({ data }) => {
         const { lists } = data[boardType]?.board;
         const listIssues = formatListIssues(lists);
-        commit(types.RECEIVE_ISSUES_FOR_LIST_SUCCESS, { listIssues, listId });
+        const listPageInfo = formatListsPageInfo(lists);
+        commit(types.RECEIVE_ISSUES_FOR_LIST_SUCCESS, { listIssues, listPageInfo, listId });
       })
       .catch(() => commit(types.RECEIVE_ISSUES_FOR_LIST_FAILURE, listId));
   },

app/assets/javascripts/boards/stores/mutation_types.js

@@ -12,6 +12,7 @@ export const UPDATE_LIST_FAILURE = 'UPDATE_LIST_FAILURE';
 export const REQUEST_REMOVE_LIST = 'REQUEST_REMOVE_LIST';
 export const RECEIVE_REMOVE_LIST_SUCCESS = 'RECEIVE_REMOVE_LIST_SUCCESS';
 export const RECEIVE_REMOVE_LIST_ERROR = 'RECEIVE_REMOVE_LIST_ERROR';
+export const REQUEST_ISSUES_FOR_LIST = 'REQUEST_ISSUES_FOR_LIST';
 export const RECEIVE_ISSUES_FOR_LIST_FAILURE = 'RECEIVE_ISSUES_FOR_LIST_FAILURE';
 export const RECEIVE_ISSUES_FOR_LIST_SUCCESS = 'RECEIVE_ISSUES_FOR_LIST_SUCCESS';
 export const REQUEST_ADD_ISSUE = 'REQUEST_ADD_ISSUE';

app/assets/javascripts/boards/stores/mutations.js

 import Vue from 'vue';
-import { sortBy, pull } from 'lodash';
+import { sortBy, pull, union } from 'lodash';
 import { formatIssue, moveIssueListHelper } from '../boards_util';
 import * as mutationTypes from './mutation_types';
 import { s__ } from '~/locale';
@@ -99,20 +99,30 @@ export default {
     notImplemented();
   },
 
-  [mutationTypes.RECEIVE_ISSUES_FOR_LIST_SUCCESS]: (state, { listIssues, listId }) => {
+  [mutationTypes.REQUEST_ISSUES_FOR_LIST]: (state, { listId, fetchNext }) => {
+    Vue.set(state.listsFlags, listId, { [fetchNext ? 'isLoadingMore' : 'isLoading']: true });
+  },
+
+  [mutationTypes.RECEIVE_ISSUES_FOR_LIST_SUCCESS]: (
+    state,
+    { listIssues, listPageInfo, listId },
+  ) => {
     const { listData, issues } = listIssues;
     Vue.set(state, 'issues', { ...state.issues, ...issues });
-    Vue.set(state.issuesByListId, listId, listData[listId]);
-    const listIndex = state.boardLists.findIndex(l => l.id === listId);
-    Vue.set(state.boardLists[listIndex], 'loading', false);
+    Vue.set(
+      state.issuesByListId,
+      listId,
+      union(state.issuesByListId[listId] || [], listData[listId]),
+    );
+    Vue.set(state.pageInfoByListId, listId, listPageInfo[listId]);
+    Vue.set(state.listsFlags, listId, { isLoading: false, isLoadingMore: false });
   },
 
   [mutationTypes.RECEIVE_ISSUES_FOR_LIST_FAILURE]: (state, listId) => {
     state.error = s__(
       'Boards|An error occurred while fetching the board issues. Please reload the page.',
     );
-    const listIndex = state.boardLists.findIndex(l => l.id === listId);
-    Vue.set(state.boardLists[listIndex], 'loading', false);
+    Vue.set(state.listsFlags, listId, { isLoading: false, isLoadingMore: false });
   },
 
   [mutationTypes.RESET_ISSUES]: state => {

app/assets/javascripts/boards/stores/state.js

@@ -9,7 +9,9 @@ export default () => ({
   activeId: inactiveId,
   sidebarType: '',
   boardLists: [],
+  listsFlags: {},
   issuesByListId: {},
+  pageInfoByListId: {},
   issues: {},
   filterParams: {},
   error: undefined,

ee/app/assets/javascripts/boards/components/board_list_header.vue

 <script>
 import { mapState, mapActions, mapGetters } from 'vuex';
 import BoardListHeaderFoss from '~/boards/components/board_list_header.vue';
-import { __, sprintf, s__, n__ } from '~/locale';
+import { __, sprintf, s__ } from '~/locale';
 import boardsStore from '~/boards/stores/boards_store';
 import { inactiveId, LIST } from '~/boards/constants';
 import eventHub from '~/sidebar/event_hub';
@@ -16,13 +16,6 @@ export default {
   computed: {
     ...mapState(['activeId', 'issuesByListId']),
     ...mapGetters(['isSwimlanesOn']),
-    issuesCount() {
-      if (this.isSwimlanesOn) {
-        return this.issuesByListId[this.list.id] ? this.issuesByListId[this.list.id].length : 0;
-      }
-
-      return this.list.issuesSize;
-    },
     issuesTooltip() {
       const { maxIssueCount } = this.list;
 
@@ -36,9 +29,6 @@ export default {
       // TODO: Remove this pattern.
       return BoardListHeaderFoss.computed.issuesTooltip.call(this);
     },
-    issuesTooltipLabel() {
-      return n__(`%d issue`, `%d issues`, this.issuesCount);
-    },
     weightCountToolTip() {
       const { totalWeight } = this.list;
 

ee/app/assets/javascripts/boards/components/epics_swimlanes.vue

 <script>
 import { mapActions, mapGetters, mapState } from 'vuex';
-import { GlIcon, GlTooltipDirective } from '@gitlab/ui';
+import { GlButton, GlIcon, GlTooltipDirective } from '@gitlab/ui';
 import Draggable from 'vuedraggable';
 import BoardListHeader from 'ee_else_ce/boards/components/board_list_header.vue';
 import { DRAGGABLE_TAG } from '../constants';
@@ -14,6 +14,7 @@ export default {
     BoardListHeader,
     EpicLane,
     IssuesLaneList,
+    GlButton,
     GlIcon,
   },
   directives: {
@@ -35,14 +36,14 @@ export default {
     },
   },
   computed: {
-    ...mapState(['epics']),
+    ...mapState(['epics', 'pageInfoByListId', 'listsFlags']),
     ...mapGetters(['getUnassignedIssues']),
     unassignedIssues() {
       return listId => this.getUnassignedIssues(listId);
     },
     unassignedIssuesCount() {
       return this.lists.reduce(
-        (total, list) => total + this.getUnassignedIssues(list.id).length,
+        (total, list) => total + this.listsFlags[list.id]?.unassignedIssuesCount || 0,
         0,
       );
     },
@@ -65,9 +66,12 @@ export default {
 
       return this.canAdminList ? options : {};
     },
+    hasMoreUnassignedIssues() {
+      return this.lists.some(list => this.pageInfoByListId[list.id]?.hasNextPage);
+    },
   },
   methods: {
-    ...mapActions(['moveList']),
+    ...mapActions(['moveList', 'fetchIssuesForList']),
     handleDragOnEnd(params) {
       const { newIndex, oldIndex, item } = params;
       const { listId } = item.dataset;
@@ -78,6 +82,13 @@ export default {
         adjustmentValue: newIndex < oldIndex ? 1 : -1,
       });
     },
+    fetchMoreUnassignedIssues() {
+      this.lists.forEach(list => {
+        if (this.pageInfoByListId[list.id]?.hasNextPage) {
+          this.fetchIssuesForList({ listId: list.id, fetchNext: true, noEpicIssues: true });
+        }
+      });
+    },
   },
 };
 </script>
@@ -142,7 +153,8 @@ export default {
           </span>
         </div>
       </div>
-      <div class="gl-display-flex" data-testid="board-lane-unassigned-issues">
+      <div data-testid="board-lane-unassigned-issues">
+        <div class="gl-display-flex">
           <issues-lane-list
             v-for="list in lists"
             :key="`${list.id}-issues`"
@@ -155,4 +167,15 @@ export default {
         </div>
       </div>
     </div>
+    <div v-if="hasMoreUnassignedIssues" class="gl-p-3 gl-pr-0 gl-sticky gl-left-0 gl-max-w-full">
+      <gl-button
+        category="tertiary"
+        variant="info"
+        class="gl-w-full"
+        @click="fetchMoreUnassignedIssues()"
+      >
+        {{ s__('Board|Load more issues') }}
+      </gl-button>
+    </div>
+  </div>
 </template>

ee/app/assets/javascripts/boards/components/issues_lane_list.vue

@@ -50,7 +50,7 @@ export default {
     };
   },
   computed: {
-    ...mapState(['activeId', 'filterParams', 'canAdminEpic']),
+    ...mapState(['activeId', 'filterParams', 'canAdminEpic', 'listsFlags']),
     treeRootWrapper() {
       return this.canAdminList && this.canAdminEpic ? Draggable : 'ul';
     },
@@ -68,12 +68,15 @@ export default {
 
       return this.canAdminList ? options : {};
     },
+    isLoadingMore() {
+      return this.listsFlags[this.list.id]?.isLoadingMore;
+    },
   },
   watch: {
     filterParams: {
       handler() {
         if (this.isUnassignedIssuesLane) {
-          this.fetchIssuesForList(this.list.id);
+          this.fetchIssuesForList({ listId: this.list.id, noEpicIssues: true });
         }
       },
       deep: true,
@@ -173,6 +176,7 @@ export default {
           :is-active="isActiveIssue(issue)"
           @show="showIssue(issue)"
         />
+        <gl-loading-icon v-if="isLoadingMore && isUnassignedIssuesLane" size="sm" class="gl-py-3" />
       </component>
     </div>
   </div>

ee/app/assets/javascripts/boards/components/sidebar/board_sidebar_epic_select.vue

@@ -5,7 +5,7 @@ import { debounceByAnimationFrame } from '~/lib/utils/common_utils';
 import { getIdFromGraphQLId } from '~/graphql_shared/utils';
 import BoardEditableItem from '~/boards/components/sidebar/board_editable_item.vue';
 import { UPDATE_ISSUE_BY_ID } from '~/boards/stores/mutation_types';
-import { RECEIVE_EPICS_SUCCESS } from '../../stores/mutation_types';
+import { RECEIVE_FIRST_EPICS_SUCCESS } from '../../stores/mutation_types';
 
 export default {
   components: {
@@ -38,7 +38,7 @@ export default {
   methods: {
     ...mapMutations({
       updateIssueById: UPDATE_ISSUE_BY_ID,
-      receiveEpicsSuccess: RECEIVE_EPICS_SUCCESS,
+      receiveEpicsSuccess: RECEIVE_FIRST_EPICS_SUCCESS,
     }),
     ...mapActions(['setActiveIssueEpic']),
     openEpicsDropdown() {

ee/app/assets/javascripts/boards/queries/epics_swimlanes.query.graphql

@@ -12,12 +12,12 @@ query BoardEE(
 ) {
   group(fullPath: $fullPath) @include(if: $isGroup) {
     board(id: $boardId) {
-      lists @include(if: $withLists) {
+      lists(issueFilters: $issueFilters) @include(if: $withLists) {
         nodes {
           ...BoardListFragment
         }
       }
-      epics(first: 2, issueFilters: $issueFilters, after: $after) {
+      epics(first: 20, issueFilters: $issueFilters, after: $after) {
         edges {
           node {
             ...BoardEpicNode
@@ -32,7 +32,7 @@ query BoardEE(
   }
   project(fullPath: $fullPath) @include(if: $isProject) {
     board(id: $boardId) {
-      lists @include(if: $withLists) {
+      lists(issueFilters: $issueFilters) @include(if: $withLists) {
         nodes {
           ...BoardListFragment
         }

ee/app/assets/javascripts/boards/stores/actions.js

@@ -10,11 +10,11 @@ import { EpicFilterType } from '../constants';
 import boardsStoreEE from './boards_store_ee';
 import * as types from './mutation_types';
 import { fullEpicId } from '../boards_util';
-import { formatListIssues, fullBoardId } from '~/boards/boards_util';
+import { formatListIssues, formatListsPageInfo, fullBoardId } from '~/boards/boards_util';
 import { getIdFromGraphQLId } from '~/graphql_shared/utils';
 import eventHub from '~/boards/eventhub';
 
-import createDefaultClient from '~/lib/graphql';
+import createGqClient, { fetchPolicies } from '~/lib/graphql';
 import epicsSwimlanesQuery from '../queries/epics_swimlanes.query.graphql';
 import issueSetEpic from '../queries/issue_set_epic.mutation.graphql';
 import listsIssuesQuery from '~/boards/queries/lists_issues.query.graphql';
@@ -25,19 +25,24 @@ const notImplemented = () => {
   throw new Error('Not implemented!');
 };
 
-export const gqlClient = createDefaultClient();
+export const gqlClient = createGqClient(
+  {},
+  {
+    fetchPolicy: fetchPolicies.NO_CACHE,
+  },
+);
 
 const fetchAndFormatListIssues = (state, extraVariables) => {
   const { endpoints, boardType, filterParams } = state;
   const { fullPath, boardId } = endpoints;
 
   const variables = {
-    ...extraVariables,
     fullPath,
     boardId: fullBoardId(boardId),
     filters: { ...filterParams },
     isGroup: boardType === BoardType.group,
     isProject: boardType === BoardType.project,
+    ...extraVariables,
   };
 
   return gqlClient
@@ -50,7 +55,7 @@ const fetchAndFormatListIssues = (state, extraVariables) => {
     })
     .then(({ data }) => {
       const { lists } = data[boardType]?.board;
-      return formatListIssues(lists);
+      return { listIssues: formatListIssues(lists), listPageInfo: formatListsPageInfo(lists) };
     });
 };
 
@@ -104,7 +109,22 @@ export default {
         }));
 
         if (!withLists) {
-          commit(types.RECEIVE_EPICS_SUCCESS, { epics: epicsFormatted });
+          commit(types.RECEIVE_EPICS_SUCCESS, epicsFormatted);
+        } else {
+          if (lists) {
+            let boardLists = lists.nodes.map(list =>
+              boardsStore.updateListPosition({ ...list, doNotFetchIssues: true }),
+            );
+            boardLists = sortBy([...boardLists], 'position');
+            commit(types.RECEIVE_BOARD_LISTS_SUCCESS, boardLists);
+          }
+
+          if (epicsFormatted) {
+            commit(types.RECEIVE_FIRST_EPICS_SUCCESS, {
+              epics: epicsFormatted,
+              canAdminEpic: epics.edges[0]?.node?.userPermissions?.adminEpic,
+            });
+          }
         }
 
         if (epics.pageInfo?.hasNextPage) {
@@ -113,12 +133,6 @@ export default {
             endCursor: epics.pageInfo.endCursor,
           });
         }
-
-        return {
-          epics: epicsFormatted,
-          lists: lists?.nodes,
-          canAdminEpic: epics.edges[0]?.node?.userPermissions?.adminEpic,
-        };
       })
       .catch(() => commit(types.RECEIVE_SWIMLANES_FAILURE));
   },
@@ -177,19 +191,28 @@ export default {
     notImplemented();
   },
 
-  fetchIssuesForList: ({ state, commit }, listId, noEpicIssues = false) => {
+  fetchIssuesForList: ({ state, commit }, { listId, fetchNext = false, noEpicIssues = false }) => {
+    commit(types.REQUEST_ISSUES_FOR_LIST, { listId, fetchNext });
+
     const { filterParams } = state;
 
     const variables = {
       id: listId,
       filters: noEpicIssues
-        ? { ...filterParams, epicWildcardId: EpicFilterType.none }
+        ? { ...filterParams, epicWildcardId: EpicFilterType.none.toUpperCase() }
         : filterParams,
+      after: fetchNext ? state.pageInfoByListId[listId].endCursor : undefined,
+      first: 20,
     };
 
     return fetchAndFormatListIssues(state, variables)
-      .then(listIssues => {
-        commit(types.RECEIVE_ISSUES_FOR_LIST_SUCCESS, { listIssues, listId });
+      .then(({ listIssues, listPageInfo }) => {
+        commit(types.RECEIVE_ISSUES_FOR_LIST_SUCCESS, {
+          listIssues,
+          listPageInfo,
+          listId,
+          noEpicIssues,
+        });
       })
       .catch(() => commit(types.RECEIVE_ISSUES_FOR_LIST_FAILURE, listId));
   },
@@ -204,7 +227,7 @@ export default {
     };
 
     return fetchAndFormatListIssues(state, variables)
-      .then(listIssues => {
+      .then(({ listIssues }) => {
         commit(types.RECEIVE_ISSUES_FOR_EPIC_SUCCESS, { ...listIssues, epicId });
       })
       .catch(() => commit(types.RECEIVE_ISSUES_FOR_EPIC_FAILURE, epicId));
@@ -214,21 +237,7 @@ export default {
     commit(types.TOGGLE_EPICS_SWIMLANES);
 
     if (state.isShowingEpicsSwimlanes) {
-      dispatch('fetchEpicsSwimlanes', {})
-        .then(({ lists, epics, canAdminEpic }) => {
-          if (lists) {
-            let boardLists = lists.map(list =>
-              boardsStore.updateListPosition({ ...list, doNotFetchIssues: true }),
-            );
-            boardLists = sortBy([...boardLists], 'position');
-            commit(types.RECEIVE_BOARD_LISTS_SUCCESS, boardLists);
-          }
-
-          if (epics) {
-            commit(types.RECEIVE_EPICS_SUCCESS, { epics, canAdminEpic });
-          }
-        })
-        .catch(() => commit(types.RECEIVE_SWIMLANES_FAILURE));
+      dispatch('fetchEpicsSwimlanes', {}).catch(() => commit(types.RECEIVE_SWIMLANES_FAILURE));
     } else if (!gon.features.graphqlBoardLists) {
       boardsStore.create();
       eventHub.$emit('initialBoardLoad');

ee/app/assets/javascripts/boards/stores/mutation_types.js

@@ -11,6 +11,7 @@ export const REQUEST_REMOVE_BOARD = 'REQUEST_REMOVE_BOARD';
 export const RECEIVE_REMOVE_BOARD_SUCCESS = 'RECEIVE_REMOVE_BOARD_SUCCESS';
 export const RECEIVE_REMOVE_BOARD_ERROR = 'RECEIVE_REMOVE_BOARD_ERROR';
 export const TOGGLE_PROMOTION_STATE = 'TOGGLE_PROMOTION_STATE';
+export const REQUEST_ISSUES_FOR_LIST = 'REQUEST_ISSUES_FOR_LIST';
 export const RECEIVE_ISSUES_FOR_LIST_FAILURE = 'RECEIVE_ISSUES_FOR_LIST_FAILURE';
 export const RECEIVE_ISSUES_FOR_LIST_SUCCESS = 'RECEIVE_ISSUES_FOR_LIST_SUCCESS';
 export const REQUEST_ISSUES_FOR_EPIC = 'REQUEST_ISSUES_FOR_EPIC';
@@ -19,6 +20,7 @@ export const RECEIVE_ISSUES_FOR_EPIC_FAILURE = 'RECEIVE_ISSUES_FOR_EPIC_FAILURE'
 export const TOGGLE_EPICS_SWIMLANES = 'TOGGLE_EPICS_SWIMLANES';
 export const RECEIVE_BOARD_LISTS_SUCCESS = 'RECEIVE_BOARD_LISTS_SUCCESS';
 export const RECEIVE_SWIMLANES_FAILURE = 'RECEIVE_SWIMLANES_FAILURE';
+export const RECEIVE_FIRST_EPICS_SUCCESS = 'RECEIVE_FIRST_EPICS_SUCCESS';
 export const RECEIVE_EPICS_SUCCESS = 'RECEIVE_EPICS_SUCCESS';
 export const RESET_EPICS = 'RESET_EPICS';
 export const SET_SHOW_LABELS = 'SET_SHOW_LABELS';

ee/app/assets/javascripts/boards/stores/mutations.js

@@ -68,6 +68,25 @@ export default {
     notImplemented();
   },
 
+  [mutationTypes.RECEIVE_ISSUES_FOR_LIST_SUCCESS]: (
+    state,
+    { listIssues, listPageInfo, listId, noEpicIssues },
+  ) => {
+    const { listData, issues, listIssuesCount } = listIssues;
+    Vue.set(state, 'issues', { ...state.issues, ...issues });
+    Vue.set(
+      state.issuesByListId,
+      listId,
+      union(state.issuesByListId[listId] || [], listData[listId]),
+    );
+    Vue.set(state.pageInfoByListId, listId, listPageInfo[listId]);
+    Vue.set(state.listsFlags, listId, {
+      isLoading: false,
+      isLoadingMore: false,
+      unassignedIssuesCount: noEpicIssues ? listIssuesCount : undefined,
+    });
+  },
+
   [mutationTypes.REQUEST_ISSUES_FOR_EPIC]: (state, epicId) => {
     Vue.set(state.epicsFlags, epicId, { isLoading: true });
   },
@@ -103,9 +122,15 @@ export default {
     state.epicsSwimlanesFetchInProgress = false;
   },
 
-  [mutationTypes.RECEIVE_EPICS_SUCCESS]: (state, { epics, canAdminEpic }) => {
-    Vue.set(state, 'epics', union(state.epics || [], epics));
+  [mutationTypes.RECEIVE_FIRST_EPICS_SUCCESS]: (state, { epics, canAdminEpic }) => {
+    Vue.set(state, 'epics', epics);
+    if (canAdminEpic !== undefined) {
       state.canAdminEpic = canAdminEpic;
+    }
+  },
+
+  [mutationTypes.RECEIVE_EPICS_SUCCESS]: (state, epics) => {
+    Vue.set(state, 'epics', union(state.epics || [], epics));
   },
 
   [mutationTypes.RESET_EPICS]: state => {

ee/spec/features/boards/swimlanes/epics_swimlanes_drag_issue_spec.rb

@@ -81,6 +81,7 @@ RSpec.describe 'epics swimlanes', :js do
 
     it 'between lists within unassigned lane' do
       wait_for_board_cards(1, 2)
+      wait_for_board_cards_in_second_epic(1, 1)
       wait_for_board_cards_in_unassigned_lane(0, 1)
 
       drag(list_from_index: 6, list_to_index: 7)

ee/spec/features/boards/swimlanes/epics_swimlanes_filtering_spec.rb

@@ -43,47 +43,60 @@ RSpec.describe 'epics swimlanes filtering', :js do
         page.find('.dropdown-item', text: 'Epic').click
       end
 
+      wait_for_all_requests
+
       stub_const("Gitlab::QueryLimiting::Transaction::THRESHOLD", 200)
     end
 
     it 'filters by author' do
+      wait_for_all_requests
+
       set_filter("author", user2.username)
       click_filter_link(user2.username)
+
       submit_filter
 
-      wait_for_requests
+      wait_for_all_requests
       wait_for_board_cards(2, 1)
       wait_for_empty_boards((3..4))
     end
 
     it 'filters by assignee' do
+      wait_for_all_requests
+
       set_filter("assignee", user.username)
       click_filter_link(user.username)
       submit_filter
 
-      wait_for_requests
+      wait_for_all_requests
 
       wait_for_board_cards(2, 1)
       wait_for_empty_boards((3..4))
     end
 
     it 'filters by milestone' do
+      wait_for_all_requests
+
       set_filter("milestone", "\"#{milestone.title}")
       click_filter_link(milestone.title)
       submit_filter
 
-      wait_for_requests
+      wait_for_all_requests
+
       wait_for_board_cards(2, 1)
       wait_for_board_cards(3, 0)
       wait_for_board_cards(4, 0)
     end
 
     it 'filters by label' do
+      wait_for_all_requests
+
       set_filter("label", testing.title)
       click_filter_link(testing.title)
       submit_filter
 
-      wait_for_requests
+      wait_for_all_requests
+
       wait_for_board_cards(2, 1)
       wait_for_empty_boards((3..4))
     end
@@ -91,7 +104,7 @@ RSpec.describe 'epics swimlanes filtering', :js do
 
   def visit_board_page
     visit project_boards_path(project)
-    wait_for_requests
+    wait_for_all_requests
   end
 
   def wait_for_board_cards(board_number, expected_cards)

ee/spec/frontend/boards/components/epics_swimlanes_spec.js

@@ -21,6 +21,18 @@ describe('EpicsSwimlanes', () => {
         epics: mockEpics,
         issuesByListId: mockIssuesByListId,
         issues,
+        pageInfoByListId: {
+          'gid://gitlab/List/1': {},
+          'gid://gitlab/List/2': {},
+        },
+        listsFlags: {
+          'gid://gitlab/List/1': {
+            unassignedIssuesCount: 1,
+          },
+          'gid://gitlab/List/2': {
+            unassignedIssuesCount: 1,
+          },
+        },
       },
       getters,
     });

ee/spec/frontend/boards/stores/actions_spec.js

@@ -104,7 +104,7 @@ describe('fetchEpicsSwimlanes', () => {
       [
         {
           type: types.RECEIVE_EPICS_SUCCESS,
-          payload: { epics: [mockEpic] },
+          payload: [mockEpic],
         },
       ],
       [],
@@ -150,7 +150,7 @@ describe('fetchEpicsSwimlanes', () => {
       [
         {
           type: types.RECEIVE_EPICS_SUCCESS,
-          payload: { epics: [mockEpic] },
+          payload: [mockEpic],
         },
       ],
       [
@@ -288,7 +288,7 @@ describe('fetchIssuesForEpic', () => {
               {
                 id: listId,
                 issues: {
-                  nodes: [mockIssue],
+                  edges: [{ node: [mockIssue] }],
                 },
               },
             ],

ee/spec/frontend/boards/stores/mutations_spec.js

@@ -206,6 +206,21 @@ describe('RECEIVE_SWIMLANES_FAILURE', () => {
   });
 });
 
+describe('RECEIVE_FIRST_EPICS_SUCCESS', () => {
+  it('populates epics and canAdminEpic with payload', () => {
+    state = {
+      ...state,
+      epics: {},
+      canAdminEpic: false,
+    };
+
+    mutations.RECEIVE_FIRST_EPICS_SUCCESS(state, { epics: mockEpics, canAdminEpic: true });
+
+    expect(state.epics).toEqual(mockEpics);
+    expect(state.canAdminEpic).toEqual(true);
+  });
+});
+
 describe('RECEIVE_EPICS_SUCCESS', () => {
   it('populates epics with payload', () => {
     state = {
@@ -213,7 +228,7 @@ describe('RECEIVE_EPICS_SUCCESS', () => {
       epics: {},
     };
 
-    mutations.RECEIVE_EPICS_SUCCESS(state, { epics: mockEpics });
+    mutations.RECEIVE_EPICS_SUCCESS(state, mockEpics);
 
     expect(state.epics).toEqual(mockEpics);
   });

locale/gitlab.pot

@@ -4179,6 +4179,9 @@ msgstr ""
 msgid "Boards|View scope"
 msgstr ""
 
+msgid "Board|Load more issues"
+msgstr ""
+
 msgid "Both project and dashboard_path are required"
 msgstr ""
 
@@ -13994,9 +13997,6 @@ msgstr ""
 msgid "Invalid URL"
 msgstr ""
 
-msgid "Invalid board"
-msgstr ""
-
 msgid "Invalid container_name"
 msgstr ""
 

spec/features/labels_hierarchy_spec.rb

@@ -17,6 +17,7 @@ RSpec.describe 'Labels Hierarchy', :js do
   let!(:project_label_1) { create(:label, project: project_1, title: 'Label_4') }
 
   before do
+    stub_feature_flags(graphql_board_lists: false)
     grandparent.add_owner(user)
 
     sign_in(user)

spec/frontend/boards/board_list_new_spec.js

+/* global List */
+/* global ListIssue */
+
+import Vuex from 'vuex';
+import { useFakeRequestAnimationFrame } from 'helpers/fake_request_animation_frame';
+import { createLocalVue, mount } from '@vue/test-utils';
+import eventHub from '~/boards/eventhub';
+import BoardList from '~/boards/components/board_list_new.vue';
+import BoardCard from '~/boards/components/board_card.vue';
+import '~/boards/models/issue';
+import '~/boards/models/list';
+import { listObj, mockIssuesByListId, issues } from './mock_data';
+import defaultState from '~/boards/stores/state';
+
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+const actions = {
+  fetchIssuesForList: jest.fn(),
+};
+
+const createStore = (state = defaultState) => {
+  return new Vuex.Store({
+    state,
+    actions,
+  });
+};
+
+const createComponent = ({
+  listIssueProps = {},
+  componentProps = {},
+  listProps = {},
+  state = {},
+} = {}) => {
+  const store = createStore({
+    issuesByListId: mockIssuesByListId,
+    issues,
+    pageInfoByListId: {
+      'gid://gitlab/List/1': { hasNextPage: true },
+      'gid://gitlab/List/2': {},
+    },
+    listsFlags: {
+      'gid://gitlab/List/1': {},
+      'gid://gitlab/List/2': {},
+    },
+    ...state,
+  });
+
+  const list = new List({
+    ...listObj,
+    id: 'gid://gitlab/List/1',
+    ...listProps,
+    doNotFetchIssues: true,
+  });
+  const issue = new ListIssue({
+    title: 'Testing',
+    id: 1,
+    iid: 1,
+    confidential: false,
+    labels: [],
+    assignees: [],
+    ...listIssueProps,
+  });
+  if (!Object.prototype.hasOwnProperty.call(listProps, 'issuesSize')) {
+    list.issuesSize = 1;
+  }
+
+  const component = mount(BoardList, {
+    localVue,
+    propsData: {
+      disabled: false,
+      list,
+      issues: [issue],
+      ...componentProps,
+    },
+    store,
+    provide: {
+      groupId: null,
+      rootPath: '/',
+    },
+  });
+
+  return component;
+};
+
+describe('Board list component', () => {
+  let wrapper;
+  useFakeRequestAnimationFrame();
+
+  describe('When Expanded', () => {
+    beforeEach(() => {
+      wrapper = createComponent();
+    });
+
+    afterEach(() => {
+      wrapper.destroy();
+    });
+
+    it('renders component', () => {
+      expect(wrapper.find('.board-list-component').exists()).toBe(true);
+    });
+
+    it('renders loading icon', () => {
+      wrapper = createComponent({
+        state: { listsFlags: { 'gid://gitlab/List/1': { isLoading: true } } },
+      });
+
+      expect(wrapper.find('[data-testid="board_list_loading"').exists()).toBe(true);
+    });
+
+    it('renders issues', () => {
+      expect(wrapper.findAll(BoardCard).length).toBe(1);
+    });
+
+    it('sets data attribute with issue id', () => {
+      expect(wrapper.find('.board-card').attributes('data-issue-id')).toBe('1');
+    });
+
+    it('shows new issue form', async () => {
+      wrapper.vm.toggleForm();
+
+      await wrapper.vm.$nextTick();
+      expect(wrapper.find('.board-new-issue-form').exists()).toBe(true);
+    });
+
+    it('shows new issue form after eventhub event', async () => {
+      eventHub.$emit(`toggle-issue-form-${wrapper.vm.list.id}`);
+
+      await wrapper.vm.$nextTick();
+      expect(wrapper.find('.board-new-issue-form').exists()).toBe(true);
+    });
+
+    it('does not show new issue form for closed list', () => {
+      wrapper.setProps({ list: { type: 'closed' } });
+      wrapper.vm.toggleForm();
+
+      expect(wrapper.find('.board-new-issue-form').exists()).toBe(false);
+    });
+
+    it('shows count list item', async () => {
+      wrapper.vm.showCount = true;
+
+      await wrapper.vm.$nextTick();
+      expect(wrapper.find('.board-list-count').exists()).toBe(true);
+
+      expect(wrapper.find('.board-list-count').text()).toBe('Showing all issues');
+    });
+
+    it('sets data attribute with invalid id', async () => {
+      wrapper.vm.showCount = true;
+
+      await wrapper.vm.$nextTick();
+      expect(wrapper.find('.board-list-count').attributes('data-issue-id')).toBe('-1');
+    });
+
+    it('shows how many more issues to load', async () => {
+      wrapper.vm.showCount = true;
+      wrapper.setProps({ list: { issuesSize: 20 } });
+
+      await wrapper.vm.$nextTick();
+      expect(wrapper.find('.board-list-count').text()).toBe('Showing 1 of 20 issues');
+    });
+  });
+
+  describe('load more issues', () => {
+    beforeEach(() => {
+      wrapper = createComponent({
+        listProps: { issuesSize: 25 },
+      });
+    });
+
+    afterEach(() => {
+      wrapper.destroy();
+    });
+
+    it('loads more issues after scrolling', () => {
+      wrapper.vm.$refs.list.dispatchEvent(new Event('scroll'));
+
+      expect(actions.fetchIssuesForList).toHaveBeenCalled();
+    });
+
+    it('does not load issues if already loading', () => {
+      wrapper.vm.$refs.list.dispatchEvent(new Event('scroll'));
+      wrapper.vm.$refs.list.dispatchEvent(new Event('scroll'));
+
+      expect(actions.fetchIssuesForList).toHaveBeenCalledTimes(1);
+    });
+
+    it('shows loading more spinner', async () => {
+      wrapper.vm.showCount = true;
+      wrapper.vm.list.loadingMore = true;
+
+      await wrapper.vm.$nextTick();
+      expect(wrapper.find('.board-list-count .gl-spinner').exists()).toBe(true);
+    });
+  });
+
+  describe('max issue count warning', () => {
+    beforeEach(() => {
+      wrapper = createComponent({
+        listProps: { issuesSize: 50 },
+      });
+    });
+
+    afterEach(() => {
+      wrapper.destroy();
+    });
+
+    describe('when issue count exceeds max issue count', () => {
+      it('sets background to bg-danger-100', async () => {
+        wrapper.setProps({ list: { issuesSize: 4, maxIssueCount: 3 } });
+
+        await wrapper.vm.$nextTick();
+        expect(wrapper.find('.bg-danger-100').exists()).toBe(true);
+      });
+    });
+
+    describe('when list issue count does NOT exceed list max issue count', () => {
+      it('does not sets background to bg-danger-100', () => {
+        wrapper.setProps({ list: { issuesSize: 2, maxIssueCount: 3 } });
+
+        expect(wrapper.find('.bg-danger-100').exists()).toBe(false);
+      });
+    });
+
+    describe('when list max issue count is 0', () => {
+      it('does not sets background to bg-danger-100', () => {
+        wrapper.setProps({ list: { maxIssueCount: 0 } });
+
+        expect(wrapper.find('.bg-danger-100').exists()).toBe(false);
+      });
+    });
+  });
+});

spec/frontend/boards/board_list_spec.js

@@ -44,7 +44,6 @@ const createComponent = ({ done, listIssueProps = {}, componentProps = {}, listP
       disabled: false,
       list,
       issues: list.issues,
-      loading: false,
       ...componentProps,
     },
     provide: {
@@ -94,7 +93,7 @@ describe('Board list component', () => {
     });
 
     it('renders loading icon', () => {
-      component.loading = true;
+      component.list.loading = true;
 
       return Vue.nextTick().then(() => {
         expect(component.$el.querySelector('.board-list-loading')).not.toBeNull();

spec/frontend/boards/stores/actions_spec.js

@@ -250,6 +250,13 @@ describe('fetchIssuesForList', () => {
     boardType: 'group',
   };
 
+  const mockIssuesNodes = mockIssues.map(issue => ({ node: issue }));
+
+  const pageInfo = {
+    endCursor: '',
+    hasNextPage: false,
+  };
+
   const queryResponse = {
     data: {
       group: {
@@ -259,7 +266,8 @@ describe('fetchIssuesForList', () => {
               {
                 id: listId,
                 issues: {
-                  nodes: mockIssues,
+                  edges: mockIssuesNodes,
+                  pageInfo,
                 },
               },
             ],
@@ -271,17 +279,25 @@ describe('fetchIssuesForList', () => {
 
   const formattedIssues = formatListIssues(queryResponse.data.group.board.lists);
 
-  it('should commit mutation RECEIVE_ISSUES_FOR_LIST_SUCCESS on success', done => {
+  const listPageInfo = {
+    [listId]: pageInfo,
+  };
+
+  it('should commit mutations REQUEST_ISSUES_FOR_LIST and RECEIVE_ISSUES_FOR_LIST_SUCCESS on success', done => {
     jest.spyOn(gqlClient, 'query').mockResolvedValue(queryResponse);
 
     testAction(
       actions.fetchIssuesForList,
-      listId,
+      { listId },
       state,
       [
+        {
+          type: types.REQUEST_ISSUES_FOR_LIST,
+          payload: { listId, fetchNext: false },
+        },
         {
           type: types.RECEIVE_ISSUES_FOR_LIST_SUCCESS,
-          payload: { listIssues: formattedIssues, listId },
+          payload: { listIssues: formattedIssues, listPageInfo, listId },
         },
       ],
       [],
@@ -289,14 +305,20 @@ describe('fetchIssuesForList', () => {
     );
   });
 
-  it('should commit mutation RECEIVE_ISSUES_FOR_LIST_FAILURE on failure', done => {
+  it('should commit mutations REQUEST_ISSUES_FOR_LIST and RECEIVE_ISSUES_FOR_LIST_FAILURE on failure', done => {
     jest.spyOn(gqlClient, 'query').mockResolvedValue(Promise.reject());
 
     testAction(
       actions.fetchIssuesForList,
-      listId,
+      { listId },
       state,
-      [{ type: types.RECEIVE_ISSUES_FOR_LIST_FAILURE, payload: listId }],
+      [
+        {
+          type: types.REQUEST_ISSUES_FOR_LIST,
+          payload: { listId, fetchNext: false },
+        },
+        { type: types.RECEIVE_ISSUES_FOR_LIST_FAILURE, payload: listId },
+      ],
       [],
       done,
     );

spec/frontend/boards/stores/mutations_spec.js

@@ -173,13 +173,23 @@ describe('Board Store Mutations', () => {
 
       state = {
         ...state,
-        issuesByListId: {},
+        issuesByListId: {
+          'gid://gitlab/List/1': [],
+        },
         issues: {},
         boardLists: mockListsWithModel,
       };
 
+      const listPageInfo = {
+        'gid://gitlab/List/1': {
+          endCursor: '',
+          hasNextPage: false,
+        },
+      };
+
       mutations.RECEIVE_ISSUES_FOR_LIST_SUCCESS(state, {
         listIssues: { listData: listIssues, issues },
+        listPageInfo,
         listId: 'gid://gitlab/List/1',
       });