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darkroom view: shortcut Alt+2 can produce a constant flickering / jittering #4286
Describe the bug
In darkroom view: In certain cases using the Alt+2 shortcut to zoom fill an image causes the image area to constantly jitter/flicker (seizure if you want). It can be stopped by using Alt+1 or Alt+3.
Alt+2 to zoom fill the image as advertised.
After confirming the issue I filed this report on behalf of someone else, that user's specs are:
Can confirm this bug on 3.10+665 on Windows 10, with OpenCL activated on an AMD RX 480.
I don't need most of the steps to reproduce (also not the GUI scrollbar setting); just resize the Darktable window untill the unzoomed image fills the grey area (as in the screenshot). Then press Alt + 2 and the jittering starts.