fix some working set view issues

Fixes #9019 
Fixes #8973
Fixes #9032

I don't know if it's related to this change, but I wanted to make this comment in code to start a discussion thread (as opposed to main comments which are no threaded).

This may be as designed or FOL, but this behavior is unexpected:

1. Open Split View with 1 file in each Working Set
    Results: text color of both Working Set files is blue when either is selected as expected.

2. Single-click on some other file in Project Tree
    Results: text color of file in Project Tree is blue. Text color of file in other Working Set is blue. Expected.

3. Select Working Set file in *other* pane as file in Project Tree

    Results: text of file in current Working Set is the only file in blue.
    Expected: text of file displayed in other pane (i.e. file in Project Tree) is blue