Loading a portrait format the previous landscape isn't cleared in preview

[stefonarch]

Showing the image or changing preview size fixes it. I didn't see that before the latest commits. It's possible to make a pile of 4 images.

[stefonarch]

In the viewer same issue I see now, images with a different size doesn't clean the background.

EDIT: no idea why I didn't see it yesterday. It depends on the compositor again. Labwc is fine, kwin_wayland, Hyprland and niri not.

[luebking]

I was gonna say before I saw your edit.
QOpenGLWidget defaults to QOpenGLWidget::NoPartialUpdate and it's now autofilled, but maybe a complete manual wipe is inevitable.

If you restore "painter.fillRect(rect(), palette().color(backgroundRole()));" from #28 (comment) is it gone?

[stefonarch]

Yes, that works fine on Niri and kwin_wayland, probably everywhere.