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Embedding a QWidget in a window container (via its windowHandle()) may cause crashes, e.g. during drag & drop and when the application goes out of scope. If a QWidget->windowHandle() is attempted to be embedded in a window container, return the pointer to the widget instead of creating a container. Add an autotest. Update documentation. [ChangeLog][QtWidgets][QWindowContainer] If createWindowContainer() is called with a QWidgetWindow argument, return pointer to the widget instead of new container. Fixes: QTBUG-119113 Change-Id: Id052a03be13adce05bbd025d86270d265dfb662e Reviewed-by: Paul Wicking <paul.wicking@qt.io> Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io> (cherry picked from commit b9ee6d3b2e465eb70ba43ea62d2ada5327a138c8) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>