Le 22/01/2023 à 03:36, Stefano Simonucci a écrit :
What is your environment (Wayland/X11, Gnome/KDE/...)?

X11 Mate

Thanks, this was supposed to work, although I do not have any experience in Mate.

What is the Qt version?
stefano@debsim:~/prova/lyx$ dpkg --get-selections |  grep -e qt

My question was more about what you see in Help>About LyX.
This tells you what Qt version is used by LyX.
It should also tell you that you are running on top of platform "xcb".

Do you use HiDPI on your system?
I don't know. How I can know it?

HiDPI is used for monitors with really high resolution, where text and UI would be too small. On plain Ubuntu, I can change that in the Display pane of the control panel. Typically, people use a 2:1 zoom ratio (but I do not use it myself).

I am surprised by the commit above. Could you try to add in ~/.lyx/preferences

\draw_strategy backingstore
this addition (in the section misc) does not seem to affect. The bug remains.

What messages do you have if you run lyx from console with option "-dbg workarea"?

JMarc

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