[feature request] Save list of open editor tabs for each local branch

Use case:

1. You work on some feature in a branch, complete it, submit a pull request.

2. You start doing some other feature in the same project. You will have to edit different files, hence, different tabs will be opened, and the initial ones will be closed.

3. Now there's a comment in pull request, that requires your reaction. You checkout those initial branch, and have to again find all the required files to recreate your "work space" in terms of a particular feature.

If IDE would've remembered tabs state for the branch, and recreate them as they were during checkout of that branch, that would be very handy, wouldn't it? This, of course applies not only to PyCharm.