Details
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Bug
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Resolution: Won't Do
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P3: Somewhat important
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None
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5.10.0
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None
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Operating systems I observed the bug on: FreeBSD, Debian Linux, SuSe Linux.
I suppose it will be the same on the other Linuxes also.
I use FVWM. But the bug also shows up when using KDE.
Attachment "arrrf.png" shows how the bug looks when trying to open a menu.
When this stage has been reached and you open new Qt apps, they appear as empty windows without visible content, only grey background.
Attachment "pages.png" shows the desktop pager when the bug started to appear.Operating systems I observed the bug on: FreeBSD, Debian Linux, SuSe Linux. I suppose it will be the same on the other Linuxes also. I use FVWM. But the bug also shows up when using KDE. Attachment "arrrf.png" shows how the bug looks when trying to open a menu. When this stage has been reached and you open new Qt apps, they appear as empty windows without visible content, only grey background. Attachment "pages.png" shows the desktop pager when the bug started to appear.
Description
UPDATE: It turned out that only KDE apps seem affected. "Pure" (i.e. non-KDE) Qt apps are not affected. It seems to be a KDE bug.
Problem: When there are many application windows open, one eventually reaches a point where Qt applications begin to show empty windows and menus, making working with Qt apps impossible.
It is the same as with old Windows, when the GDI ran out of resources. With Windows 4, Microsoft fixed this by granting every app a separate 64kb GDI resource pool instead of having all apps share the same 64Kb GDI pool.
This particular session the problem showed up when there were open the following Qt applications: 21 Konsole, 1 K3b, 1 Dolphin, 4 Ark, 1 Kate, 7 Okular, 1 KWrite
This bug is present in all Qt versions.
How to reproduce: The bug will eventually show up when you open at least 20-50 Qt app windows.
I suppose the Qt resource buffer is too small, making Qt break.
Suggested solution: Increase resource buffer at least 4x the original size.
Question: How can I set the buffer size?
