xcb: set SM_CLIENT_ID property

SM_CLIENT_ID is required by kwin for proper session management.

- move client leader initialization from screen to connection
- add SM_CLIENT_ID property to client leader

Change-Id: I19fb0d098811c865f6f13d5bc3e59a173c596a65
Task-number: QTBUG-46310
Reviewed-by: Alexander Volkov <a.volkov@rusbitech.ru>
Reviewed-by: Uli Schlachter <psychon@znc.in>
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbconnection.h b/src/plugins/platforms/xcb/qxcbconnection.h
index 348af5f155..ee5ed8906a 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.h
+++ b/src/plugins/platforms/xcb/qxcbconnection.h
@@ -403,6 +403,7 @@ public:
 
     QXcbWMSupport *wmSupport() const { return m_wmSupport.data(); }
     xcb_window_t rootWindow();
+    xcb_window_t clientLeader();
 
     bool hasDefaultVisualId() const { return m_defaultVisualId != UINT_MAX; }
     xcb_visualid_t defaultVisualId() const { return m_defaultVisualId; }
@@ -640,6 +641,7 @@ private:
 
     QXcbWindow *m_focusWindow;
 
+    xcb_window_t m_clientLeader;
     QByteArray m_startupId;
     QXcbSystemTrayTracker *m_systemTrayTracker;
     QXcbGlIntegration *m_glIntegration;