Artifacts left behind after drawing, fullscreen toggle removes them

[ElijahLynn]

Description of the problem

Cursor-like artifacts left behind while drawing. Full-screen removes them or any type of action that seems to refresh the canvas.

Basic system details

MyPaint version: 1.2.1+gitexport.bcf5a28du
Operating system: Arch Linux - Rolling Release
Desktop environment: Gnome 3

Steps to reproduce

See GIF above

Backtraces or error messages

None

[ElijahLynn]

The artifacts went away for about an hour, I don't know why. Then without restarting the application they came back.

[strikekat]

I'm getting the exact same issue as above. Any operation like moving the window, fullscreen, etc will refresh the canvas and remove the artifacting. They seem to appear with any element that appears on the canvas, i.e. the buttons in Inking mode.

I'm unfortunately stuck on X11 with the official Nvidia drivers, so wouldn't surprise me if that was responsible. I'll turn on hybrid graphics and try with Intel when I get a chance.

Basic System Details
Version: 1.2.1 (Both RPM and Flatpak)
Operating System: Fedora 30
Desktop: Gnome 3
Hardware: ThinkPad P52 Xeon with Quadro P2000

Steps to Reproduce
Any action drawing onto the canvas

Backtraces or Error Messages
None

[inigoval]

I get the same problem on ubuntu 19.10.
Anyone manage to fix this>

[MMesch]

Same issue on NixOS 20.03 with Gnome 3, mypaint 1.2.1

[jplloyd]

These artifacts look like the result of invalidation rectangles not being aligned properly, or behaving differently on different systems. It would be good to know if anyone can reproduce this, at least semi-consistently, with the latest alpha builds.

[AesaraB]

Can confirm on OpenSuse CoreOS running Wayland, this doesn't occur for me with the Flatpak (which runs under xwayland)

I'll need to confirm this on X, too

[odysseywestra]

I am on the latest Build on Arch and I'm unable to reproduce the issue. That build is working under Wayland natively. I did install the flatpack, but the same results as the native build even though that one is using Xwayland.

I can say from hardware, I'm using all AMD with Ryzen 5 5600X and Radeon 5700 XT.

[AesaraB]

I can consistently reproduce this by enabling fractional scaling on Gnome. That would explain why xwayland is handling this fine.

I'm unsure if this applies with integer scaling... and I can't be bothered to go through dconfig right now.

@odysseywestra can you attempt to reproduce this?