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The L&F of the Output Window (View) under the GTK, doesn't follow the Nimbus recommendations and it's appearance is even distracted. The issues list include internal tabs polishment and control glyph polishment, including the control glyph buttons. Other outstanding issues are in common the case of the 'GTK - Views' issue 86268.
Created attachment 34752 [details] Current gtk L&F of Output window
Passing to output...
Output uses CloseButtonTabbedPane
It's not about tabs only, it's about content IMHO - after fixing output part feel free to play more ping-pong with me :) but we need to hear first from "holyj" what specifically is wrong, which UI elements.
The Output Window in Nimbus L&F looks fine new. Closing this issue, thanks.