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Tabs that reach over the left or right end of the window are designed not consistent: Whereas at the left and right edge in the editor pane and the left edge of the output panes the tabs are simply cut off, at the right edge of the output tabs the edge is painted with little jags. Those little jags should be found at the other edges too.
Created attachment 14027 [details] screenshot
Created attachment 14028 [details] screenshot
Created attachment 14029 [details] screenshot
Created attachment 14030 [details] screenshot
I checked current state and IMHO this is fixed, tabs are simply cut off on both sides consistently, with proper dots signalizing overlapping tab text.