When window flashes content from window or desktop bellow becomes visible instead of the correct content.
You also have to move the cursor, it doesn't work otherwise.
Could you please add more detailed steps in order to reproduce this issue and more info about your system?
(In reply to Alexander Mentyu from comment #2) > Could you please add more detailed steps in order to reproduce this issue > and more info about your system? Arch Linux, kernel 4.19-rc3, Intel HD 4400 with modesetting driver, Mesa 18.2.0, Qt 5.11.1. To reproduce just open a .po file and move your cursor around, you shoud see parts of window flash when hovering upon them. Most often this happens in the main 'Translation Units(?)' area.
Fixed in Qt5.12-beta1