From 2bab8971518779ad3a841ecf74fda74d30ac94f5 Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Mon, 27 Jan 2020 13:57:53 +0200
Subject: [PATCH] [x11] Print a warning message if we're about to render a
 client un-synchronized

---
 x11client.cpp | 8 +++++++-
 x11client.h   | 1 +
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/x11client.cpp b/x11client.cpp
index d5f6af8a9..1e3bb9852 100644
--- a/x11client.cpp
+++ b/x11client.cpp
@@ -2875,6 +2875,12 @@ void X11Client::handleSync()
         addRepaintFull();
 }
 
+void X11Client::handleExpiredSync()
+{
+    qCWarning(KWIN_CORE, "0x%x will be rendered unsynchronized because pending sync request has expired", window());
+    performMoveResize();
+}
+
 void X11Client::move(int x, int y, ForceGeometry_t force)
 {
     const QPoint framePosition(x, y);
@@ -4754,7 +4760,7 @@ void X11Client::doResizeSync()
 {
     if (!syncRequest.timeout) {
         syncRequest.timeout = new QTimer(this);
-        connect(syncRequest.timeout, &QTimer::timeout, this, &X11Client::performMoveResize);
+        connect(syncRequest.timeout, &QTimer::timeout, this, &X11Client::handleExpiredSync);
         syncRequest.timeout->setSingleShot(true);
     }
     if (syncRequest.counter != XCB_NONE) {
diff --git a/x11client.h b/x11client.h
index 212120869..def23aaeb 100644
--- a/x11client.h
+++ b/x11client.h
@@ -324,6 +324,7 @@ public:
         return syncRequest;
     }
     void handleSync();
+    void handleExpiredSync();
 
     static void cleanupX11();
 
-- 
2.25.0