Created attachment 159401 [details] screenshot showing screen corruption in scrollbar and dialog SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. on fedora36 or later install the most recent okular and start it 2. enable scrollbars 3. scrollbars are invisible (black on black) but work 4. open the configure okular dialog 5. the dialog appears but entries towards the bottom of the screen become increasingly garbled and unreadable OBSERVED RESULT screen corruption in dialog and in scrollbar region EXPECTED RESULT SOFTWARE/OS VERSIONS Linux + mate (fedora36,37 and 38) (available in About System) Qt Version: 5 (default fedora version) ADDITIONAL INFORMATION The corruption is caused by commit 41e59e4f55b2c092b45afe2d8541f8198d41b534 Set Qt::HighDpiScaleFactorRoundingPolicy::PassThrough also on Unix Reverting the commit everything works again with the current master. The comment of the commit claims to not see any adverse effect after 6 months, but this is an adverse effect.
In the mean time I discovere that some environment variable was still set to cope with earlier QT problems (fints appearing many times too big) The environment variable in question was: QT_SCALE_FACTOR=0.585 The bug only occurs with this variable set. However without the variable, the fonts are still way too big compared to the rest of the OS gui.