[Qt-creator] Tab UI in Projects mode to TreeView

[Tasuku Suzuki]

Hi,

I would like to replace the double tab UI in Projects mode to a tree
view that looks something similer to the Projects tree in Edit mode.

This is because the UI doesn't work well when I open many (more than
ten) projects at once or when there are more than two projects with a
same name.

I have created a prototype and pushed a patch for that.
Screenshot: https://pbs.twimg.com/media/CKVQAo7XAAAGnEi.png:orig
Patch: https://codereview.qt-project.org/121843

Could anyeone review the patch?

Regards,
--
Tasuku Suzuki