From 0286882b3f80b3b68f904dc5d6721e0da640712a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Fri, 15 Jul 2016 16:06:09 +0200
Subject: [PATCH] Handle restart of Compositor Scene correctly for Wayland
 client

Summary:
This change ensures that KWin doesn't crash in the QPainter scene if
the compositor gets restarted and if there are Wayland clients.

Cherry-picked from master

BUG: 365471
FIXED-IN: 5.7.3

Test Plan:
Test case added to scene qpainter which triggers a restart
of the Compositor with a window being shown. Verifies that rendering
is correct afterwards.

Reviewers: #kwin, #plasma_on_wayland

Subscribers: plasma-devel, kwin

Tags: #plasma_on_wayland, #kwin

Differential Revision: https://phabricator.kde.org/D2185
---
 composite.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/composite.cpp b/composite.cpp
index f4d1e3d8ab..557ef2b6e6 100644
--- a/composite.cpp
+++ b/composite.cpp
@@ -322,6 +322,13 @@ void Compositor::startupWithWorkspace()
         c->setupCompositing();
         c->getShadow();
     }
+    if (auto w = waylandServer()) {
+        const auto clients = w->clients();
+        for (auto c : clients) {
+            c->setupCompositing();
+            c->getShadow();
+        }
+    }
 
     emit compositingToggled(true);