Display secondary button only in resolvable noteables

app/assets/javascripts/comment_type_toggle.js

@@ -12,19 +12,24 @@ class CommentTypeToggle {
 
   initDroplab() {
     this.droplab = new DropLab();
-    this.droplab.init(this.trigger, this.list, [InputSetter], {
-      InputSetter: [{
-        input: this.input,
-        valueAttribute: 'data-value',
-      },
-      {
-        input: this.button,
-        valueAttribute: 'data-button-text',
-      },
-      {
+
+    const inputSetterConfig = [{
+      input: this.input,
+      valueAttribute: 'data-value',
+    },
+    {
+      input: this.button,
+      valueAttribute: 'data-button-text',
+    }];
+    if (this.secondaryButton) {
+      inputSetterConfig.push({
         input: this.secondaryButton,
         valueAttribute: 'data-secondary-button-text',
-      }],
+      });
+    }
+
+    this.droplab.init(this.trigger, this.list, [InputSetter], {
+      InputSetter: inputSetterConfig
     });
   }
 }

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

 - noteable_type = @note.noteable_type
+
 .btn-group.append-right-10.comment-type-dropdown.js-comment-type-dropdown
   %button.btn.btn-nr.btn-create.comment-btn.js-comment-button.js-comment-submit-button
     Comment
@@ -12,8 +13,17 @@
           %strong Comment
           %p= "Add a general comment to this #{noteable_type.titleize.downcase}."
       %li.divider
-      %li#discussion{ data: { value: 'DiscussionNote', 'button-text' => 'Start discussion', 'secondary-button-text' => 'Start discussion & close merge request' } }
-        = icon('check')
-        .description
-          %strong Start discussion
-          %p= "Discuss a specific suggestion or question#{@note.can_be_resolvable? ? ' that needs to be resolved' : ''}."
+      - if @note.can_be_resolvable?
+        %li#discussion{ data: { value: 'DiscussionNote', 'button-text' => 'Start discussion', 'secondary-button-text' => "Start discussion & close #{noteable_type.titleize.downcase}" } }
+          = icon('check')
+          .description
+            %strong Start discussion
+            %p
+              Discuss a specific suggestion or question that needs to be resolved.
+      - else
+        %li#discussion{ data: { value: 'DiscussionNote', 'button-text' => 'Start discussion', 'secondary-button-text' => "Start discussion & close #{noteable_type.titleize.downcase}"} }
+          = icon('check')
+          .description
+            %strong Start discussion
+            %p
+              Discuss a specific suggestion or question.