Comment # 4 on bug 1186092 from xel

(In reply to Yifan Jiang from comment #1)
> Hello xel,
> 
> Since you mentioned "many windows from new opened programs stay invisible",
> except for the "opensuse welcome window" would you elaborate some other
> programs with this problem as well. I wonder if it only happens on QT
> windows. Thanks!

What works: Firefox, Thunderbird, Terminal (console), Nautilus, celluliod,
inkscape, Libreoffice ...

What DOESN'T work: okular, nextcloud client, blender, gimp,
Torbrowser-launcher, eclipse���, gparted���, vlc���, mumble���, Qt-creator��� ...   (��� =
there are shadows around the window, no window itself)

You could be right that it has something to do with Qt as the
Torbrowser-launcher first opens a small connect(?) window before opening the
browser itself, as a child of firefox (I assume). Same is true for eclipse and
Qt-creator: small window first, editor afterwards. However nothing happens
there, so the windows are not just invisible but also the programs stop to
work.