From e98a2b90b9ab384fce42a7db2e5f7b3f336d1e79 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tor=20Arne=20Vestb=C3=B8?= <tor.arne.vestbo@qt.io>
Date: Fri, 28 Mar 2025 14:22:19 +0100
Subject: [PATCH] Use QLastCursorPosition to check for missing cursor position

After c5792dcfd631abb4f9e2b92cd6e88d7e5c373406 the last cursor position
is reflected as a QPoint(std::numeric_limits<int>::max(), ...), and
after 209a2145f94e99f99832c3a08cdf579d8f42ca55 as 1 << 23. Instead of
hard coding the sentinel value, let's use QLastCursorPosition directly.

Pick-to: 6.8 6.5
Change-Id: I24031f3cc800d2f0028eb95f4f8597019cc945c0
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
(cherry picked from commit 4ae41c225be57492d5bf0e50c58bf18091414c47)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/gui/kernel/qsimpledrag.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gui/kernel/qsimpledrag.cpp b/src/gui/kernel/qsimpledrag.cpp
index bff1ad482bd..2ca2eca15be 100644
--- a/src/gui/kernel/qsimpledrag.cpp
+++ b/src/gui/kernel/qsimpledrag.cpp
@@ -195,7 +195,8 @@ void QBasicDrag::startDrag()
     QPoint pos;
 #ifndef QT_NO_CURSOR
     pos = QCursor::pos();
-    if (pos.x() == int(qInf())) {
+    static constexpr QGuiApplicationPrivate::QLastCursorPosition uninitializedCursorPosition;
+    if (pos == uninitializedCursorPosition) {
         // ### fixme: no mouse pos registered. Get pos from touch...
         pos = QPoint();
     }