9c47d5b2e moved it unconditionally, and it had no business moving on Linux. The
whole reason for the move is that on macOS the band's left edge is the native
traffic lights' corner (x ~ 7-85, the pill's exact spot). Nothing else has
traffic lights, so nothing else had the problem — the control just relocated on
platforms nobody asked about.
Gated on `QbzShell.isMacos && !QbzShell.systemTitleBar`, the same predicate the
view's old `chromeLeftInset` used, so the trailing position appears in exactly
the configuration that motivated it. Everywhere else the trigger is back at
x = 0, where it has always been.
Positioned with `x` rather than swapped anchors: toggling between anchors.left
and anchors.right means clearing one with `undefined` on every flip, and this is
one expression either way.
Built and smoked on Linux (gate green). macOS behaviour is unchanged by this
commit — it was already the trailing one there.
cc
vicrodh
da8fc598f8