Comment 17 for bug 165161

I thought this was something to do with the Focus Prevention Level. However, when I set that to OFF, I can still reproduce what I think is the same problem:

I keep two windows (A and B) maximized. Ensure Window A has focus.
Show Desktop (using either a keyboard shortcut or by clicking the button that is at the right end of the bottom panel by default)
Now open Window B (note that Window A is still minimized because we had used Show Desktop).;
Then Restore Desktop (same button on bottom-right by default or same keyboard shortcut).

Expected result: either Window A or Window B has focus and is above the one that does not have focus.
Actual result: I can see window A over Window B, however Window B has focus as keyboard shortcuts are caught by Window B not Window A and Window B is selected in the taskbar even though window A is above Window B.