[Bug 57679] SimHub shows black window when the app is minimized.

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57679

--- Comment #1 from Ivo Ivanov  ---
Created attachment 77866
  --> https://bugs.winehq.org/attachment.cgi?id=77866
SimHubWPF_issue.gz

WINEDEBUG=-all,+timestamp,+pid,+tid,+loaddll,+x11drv,+event,+win

Here the app window is minimized once, where the black window appears exactly
on its place. Then the app window is unminimized to its original place covering
the black frame.

Then the app window is minimized again. This time the black frame is much
smaller and appears at the top left corner of the screen. When the app window
gets unminimized, it appears at the top left corner, with its window controls
unresponsive to mouse clicks.

Manjaro Linux (Arch), Xfce (X11), Nvidia GTX 1080ti - dev driver 550.40.82