Can't decorate initially-undecorated windows

[haarp]

Hello,

decorate_window() doesn't work on windows that are initially undecorated (such as Microsoft Teams). undecorate/decorate works fine on windows launched with decorations tho.

This problem has been observed using the Xfwm4 window manager.

Also see here.

Thanks!

[dsalt]

I find that adding decoration works fine with Steam, and these ones (so far as I can tell) don't initially have decorations.

(Also Xfwm4.)