QWindow: re-order siblings on raise() and lower()

Same behavior as QWidget, and allows platform plugins to maintain order of
native windows based on the QWindow hierarchy, instead of having to manually
keep track of window levels.

Change-Id: Iacc7e9ee2527f0737c9da6debc7cec101064f782
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gui/kernel/qwindow_p.h b/src/gui/kernel/qwindow_p.h
index b8a9f5d3de..dd5aa54b4f 100644
--- a/src/gui/kernel/qwindow_p.h
+++ b/src/gui/kernel/qwindow_p.h
@@ -144,6 +144,9 @@ public:
     void updateVisibility();
     void _q_clearAlert();
 
+    enum SiblingPosition { PositionTop, PositionBottom };
+    void updateSiblingPosition(SiblingPosition);
+
     bool windowRecreationRequired(QScreen *newScreen) const;
     void create(bool recursive);
     void setTopLevelScreen(QScreen *newScreen, bool recreate);