Optimize many animated emoji repaint requests.

Telegram/SourceFiles/history/history_item.cpp

@@ -375,6 +375,13 @@ void HistoryItem::invalidateChatListEntry() {
 	history()->lastItemDialogsView.itemInvalidated(this);
 }
 
+void HistoryItem::customEmojiRepaint() {
+	if (!_textRepaintScheduled) {
+		_textRepaintScheduled = true;
+		history()->owner().requestItemRepaint(this);
+	}
+}
+
 void HistoryItem::finishEditionToEmpty() {
 	finishEdition(-1);
 	_history->itemVanished(this);

Telegram/SourceFiles/history/history_item.h

@@ -463,6 +463,7 @@ protected:
 	MessageFlags _flags = 0;
 
 	void invalidateChatListEntry();
+	void customEmojiRepaint();
 
 	void setGroupId(MessageGroupId groupId);
 
@@ -473,6 +474,7 @@ protected:
 	Ui::Text::String _text = { st::msgMinWidth };
 	int _textWidth = -1;
 	int _textHeight = 0;
+	bool _textRepaintScheduled = false;
 
 	struct SavedMediaData {
 		TextWithEntities text;

Telegram/SourceFiles/history/history_message.cpp

@@ -1498,8 +1498,7 @@ void HistoryMessage::setText(const TextWithEntities &textWithEntities) {
 	clearIsolatedEmoji();
 	const auto context = Core::MarkedTextContext{
 		.session = &history()->session(),
-		.customEmojiRepaint = [=] {
+		.customEmojiRepaint = [=] { customEmojiRepaint(); },
-			history()->owner().requestItemRepaint(this); },
 	};
 	_text.setMarkedText(
 		st::messageTextStyle,

Telegram/SourceFiles/history/view/history_view_message.cpp

@@ -1258,6 +1258,7 @@ void Message::paintText(
 		0,
 		-1,
 		context.selection);
+	item->_textRepaintScheduled = false;
 	if (!_heavyCustomEmoji && custom) {
 		_heavyCustomEmoji = true;
 		history()->owner().registerHeavyViewPart(const_cast<Message*>(this));