Expanding/collapsing a folder tree node steals focus from editor

[peterflynn]

1. Click on any folder in the project panel's tree control

Result: focus lost from editor. Pressing arrow keys scrolls tree view.

Expected: focus remains in editor.

This bug has been around a long while, so it's probably not that high priority...

[pthiess]

@redmunds

[redmunds]

FBNC to @peterflynn

[peterflynn]

Confirmed fixed