Windows QPA: Send synthesized expose events when window shrinks.

Fix the condition to check for plain move events and gain in one dimension in which case Windows will send events. Task-number: QTBUG-51038 Change-Id: I60433657f37275ee302f745291e79e465d52064d Reviewed-by: Błażej Szczygieł <[email protected]> Reviewed-by: Shawn Rutledge <[email protected]>
RDevCore · Feb 23, 2016 · 20a29fb · 20a29fb
1 parent b8f89d8
commit 20a29fb
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1467,7 +1467,9 @@ void QWindowsWindow::handleGeometryChange()
     // QTBUG-32121: OpenGL/normal windows (with exception of ANGLE) do not receive
     // expose events when shrinking, synthesize.
     if (!testFlag(OpenGL_ES2) && isExposed()
-        && !(m_data.geometry.width() >= previousGeometry.width() || m_data.geometry.height() >= previousGeometry.height())) {
+        && m_data.geometry.size() != previousGeometry.size() // Exclude plain move
+        // One dimension grew -> Windows will send expose, no need to synthesize.
+        && !(m_data.geometry.width() > previousGeometry.width() || m_data.geometry.height() > previousGeometry.height())) {
         fireExpose(QRect(QPoint(0, 0), m_data.geometry.size()), true);
     }
     if (previousGeometry.topLeft() != m_data.geometry.topLeft()) {