Tree scroll position jumps back to selection upon expand/collapse

[peterflynn]

1. Select a file near the top of the project tree view
2. Scroll down so the file is out of view
3. Expand/collapse a folder that is currently in view

Result: scroll position jumps back up to show the selected file near the top. The folder you just expanded is usually scrolled out of view.

Expected: no change in scroll position

This repros at sprint-7 but not at sprint-6.

[peterflynn]

Nominating to fix this sprint since it's a fairly recent regression. But QRB can shoot me down if need be :-)

[peterflynn]

Look good