Switching between a selected commit and selected stash doesn't update changes tab.

[scratchee]

Repro steps:

1. have both a commit and a stash.
2. Select the commit. changes tab will update to show committed changes.
3. Select the stash. changes tab will update to show stashed changes.
4. Select the same commit again, which has a grey unfocused selection highlight on it already, this will refocus the selection highlight to the active colour. The changes tab will not update to show the committed changes!

Selecting another commit and then going back fixes the problem, so the issue is lightly to do with it being previously selected, and Fork doesn't concider switching active highlights as potentially significant (often it isn't, if whatever was highlighted had no effect on the changes area then it wouldn't matter).

[DanPristupov]

#1610
#1717

[DanPristupov]

Fixed in 2.56