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O.K. it is a Qt problem.
However, I use the Microsoft standard mouse driver for the "Logitech MX-Ergo-S" trackball in conjunction with "X Mouse Button Control".
Not an exotic driver ;-). No Logitech bloatware is installed.
It is an embarrassment for Qt that standard input devices no longer work.
btw:
I would like to praise you for your fantastic work.
I have been using Calibre for over 10 years and am very satisfied!
Thank you very much
Keep up the good work...
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