Qt was upgraded from 5.12.3 to 5.12.4 and as a result some applications
(Clementine and qBittorrent) become invisible when you minimize them and
then restore them. They only become visible again when you resize their
window, and resizing the window is very slow.
This does not affect most applications. Dolphin, Kate/Kwrite, System
Settings, SMPlayer, etc, all work fine.
Rebuilding Clementine and qBittorrent didn't fix it. Rebuilding
kde-frameworks and kde-plasma didn't fix it.
Have anyone else encountered this?
