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I had multiple window-manager installed.
I used KDE for the Time beeing and after an update xdg-desktop-portal crashed each time i log in over sddm. I read a unsolved Thread about this.
I installed lightdm and nothing worked.
Then i realized i had multiple Window-manager installed. I realized that the "dde" wm was installed and had a fork of kwin. I realized that is the problem end did "pacman -Rscc" on this wm. And didn't tell you? That was it.
So if someone has the Window-Manager "deepin" installed if plasma also installed, uninstall one of them completely.
Cheers.
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