It appears the hack was not needed when we have several
tabs (popup button works as expected). Otherwise, this button
suddenly has a different size: it's bigger when selected and
smaller if not (and the holes clipped under the tab shape are
becoming quite visible in the dark mode to the left and right
of a tabbar). For the single tab we need some adjustment in
the size not to have visible difference between inactive/selected
tab.
Fixes: QTBUG-83216
Change-Id: I52511e610ae7b36f261e0218b7e432e747bc9491
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
15026f309b