window buttons overlapped with tabs
When I close a tab after lots of them had been opened, tabs resize to occupy the whole width of the window. That results in overlapping window control buttons (close/minimise/maximise).
When I move the mouse cursor around, tabs resize again to allow the window buttons to reappear.
Stably reproduced. The problem persists in the latest snapshot (1.6.689.32 (Official Build) dev (64-bit))