Add a button to delegate all discussions in a merge request

app/assets/stylesheets/pages/notes.scss

@@ -510,6 +510,7 @@ ul.notes {
 }
 
 .line-resolve-all-container {
+
   .btn-group {
     margin-left: -4px;
   }
@@ -518,6 +519,25 @@ ul.notes {
     border-top-left-radius: 0;
     border-bottom-left-radius: 0;
   }
+
+  .btn.discussion-create-issue-btn {
+    margin-left: 4px;
+
+    a {
+      padding: 0;
+      line-height: 0;
+
+      &:hover {
+        text-decoration: none;
+        border: 0;
+      }
+    }
+
+    .new-issue-for-discussion path {
+      fill: $gray-darkest;
+    }
+  }
+
 }
 
 .line-resolve-all {

app/views/discussions/_new_issue_for_all_discussions.html.haml

+- if merge_request.discussions_can_be_resolved_by?(current_user) && can?(current_user, :create_issue, @project)
+  .btn-group{ role: "group", "v-if" => "unresolvedDiscussionCount > 0" }
+    .btn.btn-default.discussion-create-issue-btn.has-tooltip{ title: "Resolve all discussions in new issue",
+                                                               "aria-label" => "Resolve all discussions in new issue",
+                                                               "data-container" => "body" }
+      = link_to custom_icon('icon_mr_issue'), new_namespace_project_issue_path(@project.namespace, @project, merge_request_for_resolving_discussions: merge_request.iid), title: "Resolve all discussions in new issue", class: 'new-issue-for-discussion'

app/views/projects/merge_requests/_show.html.haml

@@ -83,6 +83,7 @@
                   %span.line-resolve-text
                     {{ resolvedDiscussionCount }}/{{ discussionCount }} {{ resolvedCountText }} resolved
                 = render "discussions/jump_to_next"
+                = render "discussions/new_issue_for_all_discussions", merge_request: @merge_request
 
     .tab-content#diff-notes-app
       #notes.notes.tab-pane.voting_notes

doc/user/project/merge_requests/merge_request_discussion_resolution.md

@@ -53,12 +53,18 @@ are resolved.
 
 ## Move all unresolved discussions in a merge request to an issue
 
-> [Introduced][ce-7180] in GitLab 8.15.
+> [Introduced][ce-8266]
+
+To continue all open discussions in a merge request, click the button **Resolve
+all discussions in new issue**
+
+![Open new issue for all unresolved discussions](img/btn_new_issue_for_all_discussions.png)
 
-To delegate unresolved discussions to a new issue you can click the link **open
-an issue to resolve them later**.
+Alternatively, when your project only accepts merge requests when all discussions
+are resolved, there will be an **open an issue to resolve them later** link in
+the merge request-widget.
 
-![Open new issue from unresolved discussions](img/resolve_discussion_open_issue.png)
+![Link in merge request widget](img/resolve_discussion_open_issue.png)
 
 This will prepare an issue with content referring to the merge request and
 discussions.

spec/features/issues/create_issue_for_discussions_in_merge_request_spec.rb

 require 'rails_helper'
 
-feature 'Resolving all open discussions in a merge request from an issue', feature: true do
+feature 'Resolving all open discussions in a merge request from an issue', feature: true, js: true do
   let(:user) { create(:user) }
-  let(:project) { create(:project, only_allow_merge_if_all_discussions_are_resolved: true) }
+  let(:project) { create(:project) }
   let(:merge_request) { create(:merge_request, source_project: project) }
   let!(:discussion) { Discussion.for_diff_notes([create(:diff_note_on_merge_request, noteable: merge_request, project: project)]).first }
 
   before do
     project.team << [user, :master]
     login_as user
+    visit namespace_project_merge_request_path(project.namespace, project, merge_request)
+  end
+
+  it 'shows a button to resolve all discussions by creating a new issue' do
+    within('li#resolve-count-app') do
+      expect(page).to have_link "Resolve all discussions in new issue", href: new_namespace_project_issue_path(project.namespace, project, merge_request_for_resolving_discussions: merge_request.iid)
+    end
+  end
+
+  context 'resolving the discussion' do
+    before do
+      click_button 'Resolve discussion'
+    end
+
+    it 'hides the link for creating a new issue' do
+      expect(page).not_to have_link "Resolve all discussions in new issue", href: new_namespace_project_issue_path(project.namespace, project, merge_request_for_resolving_discussions: merge_request.iid)
+    end
+  end
+
+  context 'creating an issue for discussions' do
+    before do
+      click_link "Resolve all discussions in new issue", href: new_namespace_project_issue_path(project.namespace, project, merge_request_for_resolving_discussions: merge_request.iid)
+    end
+
+    it_behaves_like 'creating an issue for a discussion'
+  end
+
+  context 'for a project where all discussions need to be resolved before merging' do
+    before do
+      project.update_attribute(:only_allow_merge_if_all_discussions_are_resolved, true)
     end
 
     context 'with the internal tracker disabled' do
@@ -42,13 +72,8 @@ feature 'Resolving all open discussions in a merge request from an issue', featu
           page.click_link 'open an issue to resolve them later', href: new_namespace_project_issue_path(project.namespace, project, merge_request_for_resolving_discussions: merge_request.iid)
         end
 
-      it 'has a hidden field for the discussion' do
-        merge_request_field = find('#merge_request_for_resolving_discussions', visible: false)
-
-        expect(merge_request_field.value).to eq(merge_request.iid.to_s)
-      end
-
         it_behaves_like 'creating an issue for a discussion'
       end
     end
+  end
 end