Black artifacts and outline artifacts in editor viewports
I get black artifacts in the editor viewport. It's like anything forward-rendered (the UI mainly) gets "stuck" but with a black color. Like some buffer is not cleared correctly.
This happens in both lit and unlit mode, the only mode that is working correctly is wireframe. I can temporarily "clear" the blackness by switching to and from wireframe mode, but as soon as the camera transform is changed again, more blackness shows up.
This issue is more prone to happening in lower viewport sizes/resolutions. If I resize the viewport to make it bigger (or go fullscreen), the issue pretty much disappears. However, when I do this, I notice another issue; The "masking buffer" for the yellow actor selection outlines doesnt seem to get cleared either. When I rotate the camera view, the outline just grows according to where the selected actor is, but it doesnt disappear where it isnt.
This doesnt seem to happen in PIE/play mode.
EDIT: This doesnt happen either if I check "Game view"
Please poke me if you need more information or any clarifications.
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