qpa: Make screen geometry updates (full and available geometry) atomic

Updating the geometry and available geometry in two steps means that
QScreen will be in an inconsistent state when emitting the geometry
change signal, as the available geometry has not been updated yet.

Piggy-backing changes to the availableGeometry based on the virtual
geometry changing does not make sense, so we now tie geometry and
availableGeometry (and their size variants) to their own separate
geometryChanged and availableGeometryChanged signals.

Change-Id: Iee0ced642cbb91c470cb54bc507d2c0512482c13
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/plugins/platforms/xcb/qxcbscreen.cpp b/src/plugins/platforms/xcb/qxcbscreen.cpp
index 83ffb02362..b936df4b85 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.cpp
+++ b/src/plugins/platforms/xcb/qxcbscreen.cpp
@@ -403,7 +403,7 @@ void QXcbScreen::handleScreenChange(xcb_randr_screen_change_notify_event_t *chan
     case XCB_RANDR_ROTATION_REFLECT_Y: break;
     }
 
-    QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), geometry());
+    QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), geometry(), availableGeometry());
     QWindowSystemInterface::handleScreenOrientationChange(QPlatformScreen::screen(), m_orientation);
 
     QDpi ldpi = logicalDpi();
@@ -451,7 +451,7 @@ void QXcbScreen::updateGeometry(xcb_timestamp_t timestamp)
     m_geometry = QRect(xGeometry.topLeft()/dpr, xGeometry.size()/dpr);
     m_availableGeometry = QRect(xAvailableGeometry.topLeft()/dpr, xAvailableGeometry.size()/dpr);
 
-    QWindowSystemInterface::handleScreenAvailableGeometryChange(QPlatformScreen::screen(), m_availableGeometry);
+    QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), m_geometry, m_availableGeometry);
 }
 
 void QXcbScreen::updateRefreshRate()