Repro Steps

1. Create some working copy changes in a branch by editing a few files.
2. From the "Working Copy Changes" pane, click on the first file and then use "Ctrl+A" to select all files in the pane.
3. Now cause the pane to lose focus by clicking somewhere else (for example on a previous commit)
4. Switch back to the change from #2 above and note that all files are still selected. No matter what you do, you cannot de-select the files in this view.

The only workaround I've found is to exit and then restart SourceTree.

EXPECTED BEHAVIOR:

A) When focus is lost, none of the files in the pane should be selected; or
B) If I click on a single file from among all selected files, it should become the only selected file, implicitly de-selecting all other files.

NOTE: This behavior is not a recent regression. I have been experiencing different flavors of this underlying bug for over a year.

NOTE 2: Behavior only affects the "Working Copy Changes" pane. It does not repro if any other row in the Graph/Description grid is selected.