From 2eded918977f8c8cefdd5c938d11fc57dc9ce1fe Mon Sep 17 00:00:00 2001
From: Igor Poboiko <igor.poboiko@gmail.com>
Date: Sun, 25 Mar 2018 13:26:50 +0300
Subject: [PATCH] [effects/coverswitch] Fix broken reflection on multi-monitor
 setup

ModelViewMatrix used to paint windows (which is aware about
multi-monitor configuration) was overriden by reflectionMatrix when
painting reflections, leading to wrong placement of reflections.
Now we just multiply old matrix and reflection matrix.

BUG: 378688

Differential Revision: https://phabricator.kde.org/D10465
---
 effects/coverswitch/coverswitch.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/effects/coverswitch/coverswitch.cpp b/effects/coverswitch/coverswitch.cpp
index 303782c1b1..463e13ec49 100644
--- a/effects/coverswitch/coverswitch.cpp
+++ b/effects/coverswitch/coverswitch.cpp
@@ -677,8 +677,7 @@ void CoverSwitchEffect::paintWindowCover(EffectWindow* w, bool reflectedWindow,
     if (reflectedWindow) {
         QMatrix4x4 reflectionMatrix;
         reflectionMatrix.scale(1.0, -1.0, 1.0);
-        data.setProjectionMatrix(data.screenProjectionMatrix());
-        data.setModelViewMatrix(reflectionMatrix);
+        data.setModelViewMatrix(reflectionMatrix*data.modelViewMatrix());
         data.setYTranslation(- area.height() - windowRect.y() - windowRect.height());
         if (start) {
             data.multiplyOpacity(timeLine.currentValue());