Update task list behavior for Merge Requests

app/assets/javascripts/merge_request.js.coffee

@@ -17,8 +17,11 @@ class @MergeRequest
 
     disableButtonIfEmptyField '#commit_message', '.accept_merge_request'
 
+    # Prevent duplicate event bindings
+    @disableTaskList()
+
     if $("a.btn-close").length
-      $("li.task-list-item input:checkbox").prop("disabled", false)
+      @initTaskList()
 
     $('.merge-request-details').waitForImages ->
       $('.issuable-affix').affix offset:
@@ -77,9 +80,6 @@ class @MergeRequest
       this.$('.remove_source_branch_in_progress').hide()
       this.$('.remove_source_branch_widget.failed').show()
 
-    $('.task-list-item input:checkbox').off('change')
-    $('.task-list-item input:checkbox').change('merge_request', updateTaskState)
-
   activateTab: (action) ->
     this.$('.merge-request-tabs li').removeClass 'active'
     this.$('.tab-content').hide()
@@ -156,3 +156,22 @@ class @MergeRequest
           else
             setTimeout(merge_request.mergeInProgress, 3000)
       dataType: 'json'
+
+  initTaskList: ->
+    $('.merge-request-details .js-task-list-container').taskList('enable')
+    $(document).on 'tasklist:changed', '.merge-request-details .js-task-list-container', @updateTaskList
+
+  disableTaskList: ->
+    $('.merge-request-details .js-task-list-container').taskList('disable')
+    $(document).off 'tasklist:changed', '.merge-request-details .js-task-list-container'
+
+  # TODO (rspeicher): Make the merge request description inline-editable like a
+  # note so that we can re-use its form here
+  updateTaskList: ->
+    patchData = {}
+    patchData['merge_request'] = {'description': $('.js-task-list-field', this).val()}
+
+    $.ajax
+      type: 'PATCH'
+      url: $('form.js-merge-request-update').attr('action')
+      data: patchData

app/views/projects/merge_requests/show/_context.html.haml

-= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], remote: true, html: {class: 'edit-merge_request inline-update'} do |f|
+= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], remote: true, html: {class: 'edit-merge_request inline-update js-merge-request-update'} do |f|
   %div.prepend-top-20
     .issuable-context-title
       %label

app/views/projects/merge_requests/show/_mr_box.html.haml

@@ -3,7 +3,9 @@
 
 %div
   - if @merge_request.description.present?
-    .description
+    .description.js-task-list-container
       .wiki
         = preserve do
           = markdown(@merge_request.description, parse_tasks: true)
+      %textarea.hidden.js-task-list-field
+        = @merge_request.description