QMdiAreaPrivate::resizeToMinimumTileSize() does not take into account
scroll bars when calculating the minimum size for the QMdiArea widget.
As a result, if scroll bars are enabled or showing during a tiling
operation, the top-level widget incorrectly expands in size (instead of
utilizing the scroll bars). Therefore, we should only resize the
top-level widget if scroll bars are disabled.
Fixes: QTBUG-40821
Change-Id: I3a8b7582d23fdf12d2b09f3740eea6b60bb395c3
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
4c58569085