From 5da29fc52b38bf2c442685536ae4c18314542431 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lukas=20Br=C3=BCbach?= <Bruebach.Lukas@bdosecurity.de>
Date: Sat, 8 Aug 2026 20:38:15 +0200
Subject: [PATCH] Harden scrolling to bottom

Took 11 minutes
---
 .../widgets/server/chat_view/chat_view.cpp       | 16 +++++++++++++++-
 .../widgets/server/chat_view/chat_view.h         |  2 ++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/cockatrice/src/interface/widgets/server/chat_view/chat_view.cpp b/cockatrice/src/interface/widgets/server/chat_view/chat_view.cpp
index b885fbe4b..64812b4a4 100644
--- a/cockatrice/src/interface/widgets/server/chat_view/chat_view.cpp
+++ b/cockatrice/src/interface/widgets/server/chat_view/chat_view.cpp
@@ -13,6 +13,7 @@
 #include <QDesktopServices>
 #include <QMouseEvent>
 #include <QScrollBar>
+#include <QTimer>
 #include <libcockatrice/network/server/remote/user_level.h>
 #include <libcockatrice/settings/chat_settings.h>
 
@@ -327,7 +328,20 @@ void ChatView::appendMessage(QString message,
     }
 
     if (atBottom || messageType.testFlag(Event_RoomSay::ChatHistory)) {
-        verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+        scrollToBottom();
+    }
+}
+
+void ChatView::scrollToBottom()
+{
+    verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+
+    if (!scrollToBottomPending) {
+        scrollToBottomPending = true;
+        QTimer::singleShot(0, this, [this] {
+            scrollToBottomPending = false;
+            verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+        });
     }
 }
 
diff --git a/cockatrice/src/interface/widgets/server/chat_view/chat_view.h b/cockatrice/src/interface/widgets/server/chat_view/chat_view.h
index 506605d24..447bb33aa 100644
--- a/cockatrice/src/interface/widgets/server/chat_view/chat_view.h
+++ b/cockatrice/src/interface/widgets/server/chat_view/chat_view.h
@@ -60,6 +60,7 @@ private:
     QStringList highlightedWords;
     bool evenNumber;
     bool showTimestamps;
+    bool scrollToBottomPending = false;
     HoveredItemType hoveredItemType;
     QString hoveredContent;
     QAction *messageClicked;
@@ -67,6 +68,7 @@ private:
 
     [[nodiscard]] QTextFragment getFragmentUnderMouse(const QPoint &pos) const;
     QTextCursor prepareBlock(bool same = false);
+    void scrollToBottom();
     void appendCardTag(QTextCursor &cursor, const QString &cardName);
     void appendUrlTag(QTextCursor &cursor, QString url);
     static QColor getCustomMentionColor();