QtWidgets: don't set Qt::WA_OutsideWSRange for 0-sized non-windows

If a widget which is not a window has a width or height of 0 that
doesn't mean we don't have to invalidate its backing store. On the
contrary, the backing store must be invalidated in order to clear stale
contents from previous paint events.

A window, however, can be completely ignored if it shrinks to 0 as the
window system will take care of it.

We don't have to clear the attribute for non-windows, either.

In Qt4 we use the Qt::WA_OutsideWSRange attribute only for widgets
which are windows when determining what to do with a geometry change.
See qwidget_x11.cpp or widget_win.cpp in Qt4.

Task-number: QTBUG-42727
Change-Id: I3655737057b803ad4b92601a9851055a81bd4b6d
Reviewed-by: Paul Olav Tvete <paul.tvete@theqtcompany.com>

0 files changed, 0 insertions, 0 deletions