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Close buttons are drawn on partially hidden tabs in editor. IMO there shouldn't be a way how to close something, which is not visible. Better would be if such tab would change (when reach some minimum size) to button for shifting tabs. See screenshot.
Created attachment 12417 [details] screenshot
This is clearly a bug. Tim, I think you are working on tabs.
Fixed for metal with my integration today; one down, two to go.
Also now fixed for win classic UI.
Fixed with new editor ui infrastructure
Verified.