SUMMARY
Sometimes multiple windows can match a single window rule with defined shortcut. For example all window classes "Dolphin" match a window rule containing a shortcut rule "Meta+D". In this case only the first opened window will be effected by the shortcut rule. The proposed behavior is to roll/switch trough all matching windows by pressing the related shortcut multiple times.

STEPS TO REPRODUCE
1. Define a window shortcut rule "Meta+D" for dolphin window class
2. Open multiple dolphin instances
3. Press shortcut

OBSERVED RESULT
First opened dolphin window is getting focus


EXPECTED RESULT
All matching window classes/application instances should be switched through (similar to task switcher) by pressing shortcut "Meta+D" multiple times. So to say a narrowed alternative to task switcher.

25th ANNIVERSARY:
I am currently working on a video presentation "what kde means to me" where I also want to show some advanced use cases for window rules on several activities/desktops to better organize workflows. This should also show case why I cannot wage labor on MS windows anymore, because it grinds my nerves.
So I would love to demonstrate this feature also!

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.22.5