Every now-playing bar (New / Classic / Large / Small) is inset by the same
8 px the content pane keeps to its frame — left, right and bottom — behind
a frame-tier backdrop, so the bar's ends line up with the pane's, nothing
in it touches the window edge, and the gutter reads as one continuous
frame with the sidebar rather than a band of raw background. The Large
cover dock lifts with the bar. On macOS the gutter is 16 px: Tahoe's
Liquid Glass windows round their corners far more than before (larger
still around a toolbar) and clip whatever sits inside the curve — the
cover at the bar's left end lost its corner — and Qt has no LayoutRegion
to nest content into the curve, so the margin is the fix.
cc
vicrodh
7c71c6bf52