Merge branch 'fix-autocomplete-new-issues' into 'master'

Fix autocomplete for new issues/MRs/snippets

Fixes gitlab-org/gitlab-ce#8067

See merge request !2446

app/controllers/projects/issues_controller.rb

@@ -49,7 +49,7 @@ class Projects::IssuesController < Projects::ApplicationController
       assignee_id: ""
     )
-    @issue = @project.issues.new(issue_params)
+    @issue = @noteable = @project.issues.new(issue_params)
     respond_with(@issue)
   end

app/controllers/projects/merge_requests_controller.rb

@@ -90,6 +90,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   def new
     params[:merge_request] ||= ActionController::Parameters.new(source_project: @project)
     @merge_request = MergeRequests::BuildService.new(project, current_user, merge_request_params).execute
+    @noteable = @merge_request
     @target_branches = if @merge_request.target_project
                          @merge_request.target_project.repository.branch_names

app/controllers/projects/snippets_controller.rb

@@ -25,7 +25,7 @@ class Projects::SnippetsController < Projects::ApplicationController
   end
   def new
-    @snippet = @project.snippets.build
+    @snippet = @noteable = @project.snippets.build
   end
   def create