Add workaround for un-minimizing QWebEngineView under Gnome

Gnome WM doesn't send expose event when minimizing then restoring a
window. Presumably, due to the missing expose event the top-level
QWebEngineView is not redrawn. As a workaround, force to update
RenderWidgetHostViewQtDelegateWidget when shown.

The workaround is not needed in 6.4 and later because the issue is fixed
by 5d1ef38f9 Create a RWHV delegate in core

Fixes: QTBUG-104763
Change-Id: I4761d670d17f6dbbe3e0de82a00179eb7fd7913c
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
(cherry picked from commit 4a9fc6792fd5b37f1c40c53f47281c8bc74ad9c9)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp b/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
index 354c6df9f..a559c15d0 100644
--- a/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
+++ b/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
@@ -270,6 +270,10 @@ void RenderWidgetHostViewQtDelegateWidget::show()
     // want to show anything else than popups as top-level.
     if (parent() || m_isPopup) {
         QQuickWidget::show();
+
+        QWebEngineView *view = static_cast<QWebEngineView *>(parent());
+        if (view && view->isWindow())
+            update();
     }
 }