Bug 427578

SUMMARY

Running Neon unstable, since a few weeks ago I started noticing that when switching between activities using the "walk through activities" (or "walk through activities (reverse)"), in the destination activity no window has the focus - no window has an active border and if I hit the "window operations menu" shortcut, nothing comes up (showing no window is active).

STEPS TO REPRODUCE
1. Set up two or more activities
2. Set up "walk through activities" keyboard shortcut (it should be on by default to "Meta + Tab")
3. Open some windows in one activity
4. Switch to another activity and open some more windows
5. Switch back to the first activity

OBSERVED RESULT

No window is active on the first activity

EXPECTED RESULT

The last window that was active on the first activity, before switching, should be active when switching back.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.20.80 (but I think it was a problem in 5.19.90)
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.0

ADDITIONAL INFORMATION

kwin is installed from the Neon unstable repositories and is currently at package version 4:5.19.5+p20.04+git20201012.0328-0

It is important to note that using the activity menu to switch activities works fine(!!) - the problem is only when switching using the "walk through activities" global keyboard shortcut.

Also - switching to another virtual desktop in the same activity works fine and the correct window is made active on the destination virtual desktop, but when switching to another activity with the global keyboard shortcut, even if the new activity is currently on another virtual desktop, there will be no active window.