From 13f83f8e0cd7c247d58a1cf5a2f3f4e661e0deb3 Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@qt.io>
Date: Wed, 13 Sep 2023 08:57:03 +0200
Subject: [PATCH] Compress UpdateLater events

Handle UpdateLater events in QApplication::compressEvents

Change-Id: I0c63f88d8ed90fc56c093c534394461797d1336b
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit cb42c940787cf8c44e11f2b650d81c3d1eff1580)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/widgets/kernel/qapplication.cpp | 5 +++++
 src/widgets/kernel/qwidget_p.h      | 1 +
 2 files changed, 6 insertions(+)

diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp
index 062ff92c0ec..bfef2d2cb0d 100644
--- a/src/widgets/kernel/qapplication.cpp
+++ b/src/widgets/kernel/qapplication.cpp
@@ -792,6 +792,7 @@ bool QApplication::compressEvent(QEvent *event, QObject *receiver, QPostEventLis
     const QEvent::Type type = event->type();
     switch (type) {
     case QEvent::UpdateRequest:
+    case QEvent::UpdateLater:
     case QEvent::LayoutRequest:
     case QEvent::Resize:
     case QEvent::Move:
@@ -820,6 +821,10 @@ bool QApplication::compressEvent(QEvent *event, QObject *receiver, QPostEventLis
             static_cast<QMoveEvent *>(postedEvent.event)->m_pos =
                 static_cast<const QMoveEvent *>(event)->pos();
             break;
+        case QEvent::UpdateLater:
+            static_cast<QUpdateLaterEvent *>(postedEvent.event)->m_region +=
+                static_cast<const QUpdateLaterEvent *>(event)->region();
+            break;
         case QEvent::UpdateRequest:
         case QEvent::LanguageChange:
         case QEvent::LayoutRequest:
diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index 07153e71293..8a86b069a0e 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -82,6 +82,7 @@ public:
     inline const QRegion &region() const { return m_region; }
 
 protected:
+    friend class QApplication;
     QRegion m_region;
 };