Comment & resolve button text is done through VueJS

app/assets/javascripts/diff_notes/components/resolve_comment_btn.js.es6

+((w) => {
+  w.ResolveCommentBtn = Vue.extend({
+    props: {
+      discussionId: String
+    },
+    computed: {
+      isDiscussionResolved: function () {
+        const notes = CommentsStore.notesForDiscussion(this.discussionId),
+              discussion = CommentsStore.state[this.discussionId];
+        let allResolved = true;
+
+        for (const noteId of notes) {
+          const note = discussion[noteId];
+
+          if (!note.resolved) {
+            allResolved = false;
+          }
+        }
+
+        return allResolved;
+      },
+      buttonText: function () {
+        if (this.isDiscussionResolved) {
+          return "Comment & unresolve discussion";
+        } else {
+          return "Comment & resolve discussion";
+        }
+      }
+    }
+  });
+}(window));

app/assets/javascripts/diff_notes/components/resolve_count.js.es6

@@ -15,7 +15,7 @@
           let resolved = true;
           for (const noteId in comments) {
-            const commentResolved = comments[noteId];
+            const commentResolved = comments[noteId].resolved;
             if (!commentResolved) {
               resolved = false;

app/assets/javascripts/diff_notes/diff_notes_bundle.js.es6

@@ -11,6 +11,7 @@ $(() => {
     components: {
       'resolve-btn': ResolveBtn,
       'resolve-all-btn': ResolveAllBtn,
+      'resolve-comment-btn': ResolveCommentBtn,
     }
   });

app/assets/javascripts/notes.js

@@ -352,7 +352,7 @@
       form.find("#note_line_code").remove();
       form.find("#note_position").remove();
       form.find("#note_type").remove();
-      form.find('.js-comment-resolve-button').remove();
+      form.find('.js-comment-resolve-button').closest('resolve-comment-btn').remove();
       return this.parentTimeline = form.parents('.timeline');
     };
@@ -397,8 +397,6 @@
     Notes.prototype.addDiscussionNote = function(xhr, note, status) {
       var $form = $(xhr.target);
-      this.renderDiscussionNote(note);
-      this.removeDiscussionNoteForm($form);
       if ($form.attr('data-resolve-all') != null) {
         var namespacePath = $form.attr('data-namespace-path'),
@@ -411,6 +409,9 @@
           ResolveService.toggleResolveForDiscussion(namespace, mergeRequestId, discussionId);
         }
       }
+
+      this.renderDiscussionNote(note);
+      this.removeDiscussionNoteForm($form);
     };
@@ -588,6 +589,7 @@
      */
     Notes.prototype.setupDiscussionNoteForm = function(dataHolder, form) {
+      var canResolve = dataHolder.attr('data-resolvable');
       form.attr('id', "new-discussion-note-form-" + (dataHolder.data("discussionId")));
       form.attr("data-line-code", dataHolder.data("lineCode"));
       form.find("#note_type").val(dataHolder.data("noteType"));
@@ -598,6 +600,16 @@
       form.find("#note_noteable_type").val(dataHolder.data("noteableType"));
       form.find("#note_noteable_id").val(dataHolder.data("noteableId"));
       form.find('.js-note-discard').show().removeClass('js-note-discard').addClass('js-close-discussion-note-form').text(form.find('.js-close-discussion-note-form').data('cancel-text'));
+
+      if (canResolve === 'false') {
+        form.find('resolve-comment-btn').remove();
+      } else if (DiffNotesApp) {
+        var $commentBtn = form.find('resolve-comment-btn');
+        $commentBtn
+          .attr(':discussion-id', `'${dataHolder.data("discussionId")}'`);
+        DiffNotesApp.$compile($commentBtn.get(0));
+      }
+
       this.setupNoteForm(form);
       form.find(".js-note-text").focus();
       form

app/helpers/notes_helper.rb

@@ -79,7 +79,7 @@ module NotesHelper
   def link_to_reply_discussion(discussion, line_type = nil)
     return unless current_user
-    data = discussion.reply_attributes.merge(line_type: line_type)
+    data = discussion.reply_attributes.merge(line_type: line_type, resolvable: discussion.can_resolve?(current_user))
     button_tag 'Reply...', class: 'btn btn-text-field js-discussion-reply-button',
                            data: data, title: 'Add a reply'

app/views/discussions/_resolve_all.html.haml

@@ -2,7 +2,7 @@
   %resolve-all-btn{ ":namespace-path" => "'#{discussion.project.namespace.path}'",
       ":project-path" => "'#{discussion.project.path}'",
       ":discussion-id" => "'#{discussion.id}'",
-      ":merge-request-id" => "#{discussion.first_note.noteable.iid}",
+      ":merge-request-id" => "#{discussion.first_note.noteable.try(:iid)}",
       "inline-template" => true,
       "v-cloak" => true }
     %button.btn.btn-default{ type: "button", "@click" => "resolve", ":disabled" => "loading" }

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

@@ -4,6 +4,8 @@
       = link_to 'Close merge request', merge_request_path(@merge_request, merge_request: {state_event: :close }), method: :put, class: "btn btn-nr btn-comment btn-close close-mr-link js-note-target-close", title: "Close merge request", data: {original_text: "Close merge request", alternative_text: "Comment & close merge request"}
     - if @merge_request.closed?
       = link_to 'Reopen merge request', merge_request_path(@merge_request, merge_request: {state_event: :reopen }), method: :put, class: "btn btn-nr btn-comment btn-reopen reopen-mr-link js-note-target-reopen", title: "Reopen merge request", data: {original_text: "Reopen merge request", alternative_text: "Comment & reopen merge request"}
-  = submit_tag 'Comment & resolve discussion', class: "btn btn-nr btn-create append-right-10 comment-btn js-comment-resolve-button", data: { namespace_path: "#{@merge_request.project.namespace.path}", project_path: "#{@merge_request.project.path}" }
+  %resolve-comment-btn{ "inline-template" => true, ":discussion-id" => "" }
+    %button.btn.btn-nr.btn-default.append-right-10.js-comment-resolve-button{ type: "submit", data: { namespace_path: "#{@merge_request.project.namespace.path}", project_path: "#{@merge_request.project.path}" } }
+      {{ buttonText }}
 #notes= render "projects/notes/notes_with_form"

app/views/projects/notes/_form.html.haml

@@ -5,7 +5,7 @@
   = f.hidden_field :commit_id
   = f.hidden_field :line_code
   = f.hidden_field :noteable_id
-  = hidden_field_tag :noteable_iid, @note.noteable.iid
+  = hidden_field_tag :noteable_iid, @note.noteable.try(:iid)
   = f.hidden_field :noteable_type
   = f.hidden_field :type
   = f.hidden_field :position