QDockWidget::isFloating() returns true for single, floating dock
widgets. It returns false, if the dock widget is part of a floating
tab (i.e. it is a QDockWidgetGroupWindow child).
=> Clarify documentation.
Pick-to: 6.6 6.5
Change-Id: I3c5a4a86b89dcb001e7561de7dcc604bae0d9cee
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 92b5992a29)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>