From 219b1b755c84b6588035ef2ad7633a4c7e51d8fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Wed, 4 Nov 2015 14:50:15 +0100
Subject: [PATCH] [server] Flush client after sending a frameRendered callback

---
 src/wayland/surface_interface.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/wayland/surface_interface.cpp b/src/wayland/surface_interface.cpp
index 25516ddc48..d55cc3025f 100644
--- a/src/wayland/surface_interface.cpp
+++ b/src/wayland/surface_interface.cpp
@@ -173,11 +173,15 @@ void SurfaceInterface::frameRendered(quint32 msec)
 {
     Q_D();
     // notify all callbacks
+    const bool needsFlush = !d->current.callbacks.isEmpty();
     while (!d->current.callbacks.isEmpty()) {
         wl_resource *r = d->current.callbacks.takeFirst();
         wl_callback_send_done(r, msec);
         wl_resource_destroy(r);
     }
+    if (needsFlush)  {
+        client()->flush();
+    }
 }
 
 void SurfaceInterface::Private::destroy()