For example, if I use only the super key to open the menu, then Firefox windows often pop up still, it's just weird. (also I'm using the standard plasma panel, I don't like Latte Dock)
KDE
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Plasma 6 Bugs
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
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I want to do the same thing, or similar. For my htpc I have a mini keyboard and want to use the super key to switch windows and the "menu" button to open home.
That sounds very doable, assuming I understand what home means.
To me it seems like the problem is that the panel has the 'plasmashell' window type. If it had its own type this wouldn't be a problem. 😿
Just add a shortcut to crash plasma shell, works consistently. /s