Display artifacts on HiDPI when render cache is invalidated
GIMP version: master
Operating System: Linux at least
Description of the bug
Since adding the render cache, there is a weird display bug on master. Each time you create a new image or switch between multiple opened images, the display refresh shows a grid:
It disappears if you just move the mouse.
Is the bug reproducible? Each time.
- Create a new image with background color (white or black both work well as the "grid" pattern is some grey).
Expected result: you get an image with full color.
Actual result: you get the grid until you move the cursor.