Comment 13 for bug 1458220

(In reply to Rémi Verschelde from comment #6)
> Still, all that stuff does not fix the sddm flaw of showing "us" keyboard
> layout and grabbing the correct one when you start typing.

This is confirmed by 3 people in the upstream report, best comment there.
We can't do much about this.

Added a short note to Errata:
https://wiki.mageia.org/en/Mageia_5_Errata#sddm