Notification in the top-right, and OBS showing the same notification became a solid black rectangle.
https://files.mastodon.online/media_attachments/files/113/480/801/655/511/647/original/689661b6c3f1bcd5.png
Added scaffolding for layer rules, along with a block-out-from rule. Now you can finally block notifications from screencasts!
Though, layer-shell surfaces don't have a "geometry" so if they have shadows or transparent padding, all of that becomes solid black, since niri has no way to know where the "actual content" of the layer surface is (that's what geometry is for windows).
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