fix deselect of users

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

@@ -63,14 +63,9 @@ export default {
     },
   },
   watch: {
-    board: {
-      handler() {
-        this.$nextTick(() => {
-          new UsersSelect();
-        });
-      },
-      deep: true,
-    }
+    selected() {
+      new UsersSelect();
+    },
   },
   mounted() {
     this.$nextTick(() => {

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

@@ -55,14 +55,14 @@ gl.issueBoards.BoardsStore = {
     this.state.currentPage = page;
   },
   updateBoardConfig(board = {}) {
+    this.boardConfig.id = board.id;
     this.boardConfig.name = board.name;
     this.boardConfig.milestone = board.milestone;
     this.boardConfig.milestone_id = board.milestone_id;
-    this.boardConfig.id = board.id;
     this.boardConfig.weight = board.weight;
     this.boardConfig.labels = board.labels || [];
     this.boardConfig.assignee_id = board.assignee_id;
-    Vue.set(this.boardConfig, 'assignee', board.assignee);
+    this.boardConfig.assignee = board.assignee || {};
   },
   addList (listObj, defaultAvatar) {
     const list = new List(listObj, defaultAvatar);

app/assets/javascripts/users_select.js

@@ -443,8 +443,7 @@ function UsersSelect(currentUser, els) {
           if ($el.closest('.add-issues-modal').length) {
             gl.issueBoards.ModalStore.store.filter[$dropdown.data('field-name')] = user.id;
           } else if ($el.closest('.js-board-config-modal').length) {
-            gl.issueBoards.BoardsStore.boardConfig.assignee = user;
-            gl.issueBoards.BoardsStore.boardConfig.assignee_id = user.id;
+            gl.issueBoards.BoardsStore.boardConfig.assignee = isMarking ? user : {};
           } else if ($dropdown.hasClass('js-filter-submit') && (isIssueIndex || isMRIndex)) {
             return Issuable.filterResults($dropdown.closest('form'));
           } else if ($dropdown.hasClass('js-filter-submit')) {