4bc76c2647
When the first QEglFSWindow got created for a QWindow, a backing store was created with it and associated to the new QEglFSWindow. When the window was hidden on the platform screen, the QEglFSWindow got deleted and re-created when it was supposed to be shown. The re-created QEglFSWindow was no longer associated to the backing store. It was therefore not rendered on the screen. => ensure that the backing store is re-associated to the QEglFSWindow, corrsponding to the QWindow argument passed to flush(). No autotest is added, because the fix is purely visual. The widgets/menus example can be used to test the functionality manually (see bug reports). Fixes: QTBUG-115196 Fixes: QTBUG-116769 Pick-to: 6.5 6.2 Change-Id: I92ce2e8f7e76bd2d26e713a4d20612d079fb4717 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io> (cherry picked from commit 4bc8f548222a0dd2967063a23e76c37d302253cb) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>