From 14cf9f0e45c7617d787eba8d81bf9fd1cd66754b Mon Sep 17 00:00:00 2001
From: Jan Grulich <jgrulich@redhat.com>
Date: Thu, 11 Feb 2021 15:12:32 +0100
Subject: [PATCH] Get correct decoration margins region

Size we use to calculate margins region already contains size including
margins. This resulted into bigger region and not properly damaging
region we need to update.

Pick-to: 5.15
Change-Id: Id1b7f4cd2a7b894b82db09c5af2b2d1f1f43fa2a
---

diff --git a/src/client/qwaylandabstractdecoration.cpp b/src/client/qwaylandabstractdecoration.cpp
index 87dd6ce..b6ee43c 100644
--- a/src/client/qwaylandabstractdecoration.cpp
+++ b/src/client/qwaylandabstractdecoration.cpp
@@ -108,11 +108,11 @@
 static QRegion marginsRegion(const QSize &size, const QMargins &margins)
 {
     QRegion r;
-    const int widthWithMargins = margins.left() + size.width() + margins.right();
-    r += QRect(0, 0, widthWithMargins, margins.top()); // top
-    r += QRect(0, size.height()+margins.top(), widthWithMargins, margins.bottom()); //bottom
+
+    r += QRect(0, 0, size.width(), margins.top()); // top
+    r += QRect(0, size.height()-margins.bottom(), size.width(), margins.bottom()); //bottom
     r += QRect(0, margins.top(), margins.left(), size.height()); //left
-    r += QRect(size.width()+margins.left(), margins.top(), margins.right(), size.height()); // right
+    r += QRect(size.width()-margins.left(), margins.top(), margins.right(), size.height()-margins.top()); // right
     return r;
 }