SUMMARY Activating brush horizontal or vertical mirror the edit brush settings is affected on it's preview. STEPS TO REPRODUCE 1. activate "horizontal mirror tool" or "vertical mirror tool" 2. open the "edit brush settings" 3. brush preview will be affected ( only updated when opening the settings ) OBSERVED RESULT brush preview is painting with the mirror tools active EXPECTED RESULT rendering the brush preview without optional canvas settings like horizontal or vertical mirror SOFTWARE/OS VERSIONS Windows: 10 Qt Version: 5.12 ADDITIONAL INFORMATION preview of the bug https://krita-artists.org/uploads/default/original/3X/9/f/9f83fc21cfa104a144ed0c141e7d978304a5737e.png https://krita-artists.org/uploads/default/original/3X/d/a/dab3b341651ed9a50cd479b73a997a2c568f0567.gif
I can confirm this on the master branch on Windows. That is something I didn't even think to test. I am guessing when the previews are being created, they can just temporarily turn off any of those mirrror settings if they are on.
There is a merge request to fix this. We can close this whenever it gets merged to master. https://invent.kde.org/graphics/krita/-/merge_requests/2365