Artifacts or crashes when undoing mid-stroke

[TJYSunset]

Reproduction

Switch to paint brush tool. Press and hold left mouse button or a pen, drag it around. Press Ctrl+Z before releasing mouse/pen. Artifacts would appear around the drawn line, and the most recent undo histories would appear to be corrupt. In worse cases Affinity would crash without any message.

System Information

Windows 10 21H1, just updated everything available in system settings

Ryzen 7 3800X

~20GB unused RAM

GTX 1660 Ti w/ latest driver. Enabling/disabling GPU acceleration doesn't seem to affect the bug. Also >5GB unused VRAM.

Also reproduced on my friend's Microsoft Surface (exact model unknown).

attachment_Log.txt 95fc566b-9674-4931-9bfb-c2e6af083b02.dmp

[Chris B]

Hey TJYSunset,

I got a crash doing this—as soon as I hit Ctrl+Z the app bombed out.

I'll get this logged - thanks!