From 2c2a3a9bef9652a6de7213ca88a7c3de72f20e2b Mon Sep 17 00:00:00 2001
From: Mikhail Khachayants <tyler92@inbox.ru>
Date: Mon, 17 May 2021 13:31:41 +0300
Subject: [PATCH] Utils: Fix crash on showing tooltips when screen
 configuration changed

Check QGuiApplication::screenAt(QPoint) return value. TextTip will use
QGuiApplication::primaryScreen() if it's nullptr.

Fixes: QTCREATORBUG-25747
Change-Id: If02648966e24f96f8c9a92e91b2bd27c1efc5f9e
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
---
 src/libs/utils/tooltip/tips.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/libs/utils/tooltip/tips.cpp b/src/libs/utils/tooltip/tips.cpp
index cab6bad63c0..2a1f4f8093f 100644
--- a/src/libs/utils/tooltip/tips.cpp
+++ b/src/libs/utils/tooltip/tips.cpp
@@ -206,7 +206,12 @@ void TextTip::configure(const QPoint &pos)
     // Try to find a nice width without unnecessary wrapping.
     setWordWrap(false);
     int tipWidth = sizeHint().width();
-    const int screenWidth = QGuiApplication::screenAt(pos)->availableGeometry().width();
+
+    QScreen *screen = QGuiApplication::screenAt(pos);
+    if (!screen)
+        screen = QGuiApplication::primaryScreen();
+
+    const int screenWidth = screen->availableGeometry().width();
     const int maxDesiredWidth = int(screenWidth * .5);
     if (tipWidth > maxDesiredWidth) {
         setWordWrap(true);