From 38cdbd2bcd6c11c69e2b03fd309df632acd70621 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robert=20L=C3=B6hning?= <robert.loehning@qt.io>
Date: Mon, 7 Mar 2022 22:30:20 +0100
Subject: [PATCH] ManhattanStyle: Avoid crash when zooming invalid image

Task-number: QTBUG-101581
Change-Id: I4070efe266fbbd579b021cd9c03465c85313e042
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
---
 src/plugins/coreplugin/manhattanstyle.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/plugins/coreplugin/manhattanstyle.cpp b/src/plugins/coreplugin/manhattanstyle.cpp
index a6b94660f6f..d4a4cdbe6f5 100644
--- a/src/plugins/coreplugin/manhattanstyle.cpp
+++ b/src/plugins/coreplugin/manhattanstyle.cpp
@@ -189,6 +189,14 @@ QRect ManhattanStyle::subElementRect(SubElement element, const QStyleOption *opt
 QRect ManhattanStyle::subControlRect(ComplexControl control, const QStyleOptionComplex *option,
                                      SubControl subControl, const QWidget *widget) const
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 2, 5)
+    // Workaround for QTBUG-101581, can be removed when building with Qt 6.2.5 or higher
+    if (control == CC_ScrollBar) {
+        const auto scrollbar = qstyleoption_cast<const QStyleOptionSlider *>(option);
+        if (scrollbar && qint64(scrollbar->maximum) - scrollbar->minimum > INT_MAX)
+            return QRect(); // breaks the scrollbar, but avoids the crash
+    }
+#endif
     return QProxyStyle::subControlRect(control, option, subControl, widget);
 }