#1789 Odd track selection and refresh behavior for undo

[musewhirl]

It's difficult to know what's going on under the covers, and this does vary with scenario. I'll add the basics below, some of which may be unnecessary.

Steps to reproduce:

1. Open new session
2. Set track 1 to instrument #10 and archive the track
3. Set track 2 to instrument #10
4. Set track 3 to instrument #1
5. Set track 4 to instrument #2
6. Set track 5 to instrument #3
7. Add a new track 6 which automatically is set to instrument #4 and is selected
8. Verify that the Track Parameters also shows #4
9. Now undo
10. For a freshly installed RG, track 1 is automatically selected for some reason, as opposed to track 5 which was last selected. Yet Track Parameters still says instrument #4
11. Mysteriously, for my default session, it's track 2 which is selected instead, but Track Parameters still says #4
12. Clicking on track 2 does cause Track Parameters to show its correct instrument #10

So, obviously a Track Parameters refresh issue. But why does it select track 1, or as in at least one session track 2, on undo and not the track which was selected beforehand?

[Philip Leishman]

Yes there was some track selection logic missing on undo.
See Codeberg pull request