From 5020d1b22a31f5fe45287547037c57fa5aeb06d7 Mon Sep 17 00:00:00 2001
From: Eirik Aavitsland <eirik.aavitsland@qt.io>
Date: Tue, 3 May 2022 15:16:05 +0200
Subject: [PATCH] Avoid rubberband artifacts under fractional DPR scaling
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Expand the rubberband repaint area with one pixel to account for
rounding on screens with fractional device pixel ratio.

Fixes: QTBUG-102717
Pick-to: 6.3 6.2
Change-Id: Iede638d48dfbc3156b02ada28dfe99719b9d5efa
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
---
 src/widgets/graphicsview/qgraphicsview.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/widgets/graphicsview/qgraphicsview.cpp b/src/widgets/graphicsview/qgraphicsview.cpp
index e47c214ec68..c24a73eb1ff 100644
--- a/src/widgets/graphicsview/qgraphicsview.cpp
+++ b/src/widgets/graphicsview/qgraphicsview.cpp
@@ -732,7 +732,7 @@ QRegion QGraphicsViewPrivate::rubberBandRegion(const QWidget *widget, const QRec
     option.shape = QRubberBand::Rectangle;
 
     QRegion tmp;
-    tmp += rect;
+    tmp += rect.adjusted(-1, -1, 1, 1);
     if (widget->style()->styleHint(QStyle::SH_RubberBand_Mask, &option, widget, &mask))
         tmp &= mask.region;
     return tmp;