From 9d4a7c3d19368d6e087d74a6217dd2c25406d3e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20L=C3=BCbking?= <thomas.luebking@gmail.com>
Date: Sun, 28 Aug 2011 14:23:34 +0200
Subject: [PATCH] drop ignored damage events from the X11 event queue

---
 composite.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/composite.cpp b/composite.cpp
index 7257bb6203..e58537d4c7 100644
--- a/composite.cpp
+++ b/composite.cpp
@@ -587,7 +587,19 @@ static QVector<QRect> damageRects;
 void Toplevel::damageNotifyEvent(XDamageNotifyEvent* e)
 {
     if (damageRatio == 1.0) // we know that we're completely damaged, no need to tell us again
+    {   // drop events
+        while (XPending(display())) {
+            EventUnion e2;
+            if (XPeekEvent(display(), &e2.e) && e2.e.type == Extensions::damageNotifyEvent() &&
+                    e2.e.xany.window == frameId()) {
+                XNextEvent(display(), &e2.e);
+                continue;
+            }
+            break;
+        }
+
         return;
+    }
 
     const float area = rect().width()*rect().height();
     damageRects.reserve(16);