Give merge request widget the vars it desires

app/controllers/projects/merge_requests_controller.rb

@@ -7,6 +7,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   before_action :closes_issues, only: [:edit, :update, :show, :diffs, :commits, :builds]
   before_action :validates_merge_request, only: [:show, :diffs, :commits, :builds]
   before_action :define_show_vars, only: [:show, :diffs, :commits, :builds]
+  before_action :define_widget_vars, only: [:merge, :cancel_merge_when_build_succeeds]
   before_action :ensure_ref_fetched, only: [:show, :diffs, :commits, :builds]
 
   # Allow read any merge_request
@@ -301,6 +302,10 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     end
   end
 
+  def define_widget_vars
+    @ci_commit = @merge_request.ci_commit
+  end
+
   def invalid_mr
     # Render special view for MR with removed source or target branch
     render 'invalid'