I've been working on implementing advanced search feature to filter tickets based on its metadata like effort, severity, difficulty, priority, author, tags and assignee. In this way a user can filter tickets based on specific requirements by filling the advanced search form.
For this I created a new view: /+tickets/query which contains a form for searching tickets.

Screenshot:

CR: https://codereview.appspot.com/256230043

It still requires some UI improvements which I'll finish it soon.

I've also been improving the implementation of comment mechanism in ticket modify view.
The new implementation now supports markdown syntax. A user can reply to comments and also new comment is automatically posted if any metadata is updated.
For eg: if effort field is changed from None to 3, a comment will be posted as "Update: Effort changed from None to 3" which will be like any other comment.

Screenshot:


CR: https://codereview.appspot.com/256840043/