SUMMARY

If using the "recently used" sort order, pressing Alt+Tab will switch to the last used window. If the "Hidden" option under "Minimization" under "Filter Windows by" is checked, pressing Alt+Tab switches windows unpredictably.

Switching between minimized windows differs from the switching behavior when not filtering windows by minimization. The steps below may be repeated with only "Recently used" sort order set and the "Minimization" filter unchecked, and the expected behavior is observed.


STEPS TO REPRODUCE
1. System Settings > Task Switcher
2. Set sort order to "Recently used"
3. Check "Hidden windows" under "Minimization"
4. Apply settings
5. Open two windows: A and B
6. Focus and then minimize windows A and B, in that order; B is now the MRU (most recently used) window
7. Press Alt+Tab once to restore a window.

OBSERVED RESULT

Window restored by Alt+Tab is A

EXPECTED RESULT

Window restored by Alt+Tab is B, the MRU window.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.22.1
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Kernel Version: 5.12.11-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-4790K CPU @ 4.00GHz
Memory: 15.3 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4600