Show nice General icon in an empty topic.

Telegram/SourceFiles/history/view/history_view_service_message.cpp

@@ -678,7 +678,11 @@ EmptyPainter::EmptyPainter(
 : _history(topic->history())
 , _topic(topic)
 , _icon(
-	std::make_unique<Info::Profile::TopicIconView>(topic, paused, update))
+	std::make_unique<Info::Profile::TopicIconView>(
+		topic,
+		paused,
+		update,
+		st::msgServiceFg))
 , _header(st::msgMinWidth)
 , _text(st::msgMinWidth) {
 	fillAboutTopic();

Telegram/SourceFiles/info/profile/info_profile_cover.cpp

@@ -121,7 +121,20 @@ TopicIconView::TopicIconView(
 	not_null<Data::ForumTopic*> topic,
 	Fn<bool()> paused,
 	Fn<void()> update)
+: TopicIconView(
+	topic,
+	std::move(paused),
+	std::move(update),
+	st::windowSubTextFg) {
+}
+
+TopicIconView::TopicIconView(
+	not_null<Data::ForumTopic*> topic,
+	Fn<bool()> paused,
+	Fn<void()> update,
+	const style::color &generalIconFg)
 : _topic(topic)
+, _generalIconFg(generalIconFg)
 , _paused(std::move(paused))
 , _update(std::move(update)) {
 	setup(topic);
@@ -218,9 +231,14 @@ void TopicIconView::setupPlayer(not_null<Data::ForumTopic*> topic) {
 void TopicIconView::setupImage(not_null<Data::ForumTopic*> topic) {
 	using namespace Data;
 	if (topic->isGeneral()) {
-		_image = ForumTopicGeneralIconFrame(
-			st::infoForumTopicIcon.size,
-			st::windowSubTextFg);
+		rpl::single(rpl::empty) | rpl::then(
+			style::PaletteChanged()
+		) | rpl::start_with_next([=] {
+			_image = ForumTopicGeneralIconFrame(
+				st::infoForumTopicIcon.size,
+				_generalIconFg);
+			_update();
+		}, _lifetime);
 		return;
 	}
 	rpl::combine(

Telegram/SourceFiles/info/profile/info_profile_cover.h

@@ -50,6 +50,11 @@ public:
 		not_null<Data::ForumTopic*> topic,
 		Fn<bool()> paused,
 		Fn<void()> update);
+	TopicIconView(
+		not_null<Data::ForumTopic*> topic,
+		Fn<bool()> paused,
+		Fn<void()> update,
+		const style::color &generalIconFg);
 
 	void paintInRect(QPainter &p, QRect rect);
 
@@ -61,6 +66,7 @@ private:
 	void setupImage(not_null<Data::ForumTopic*> topic);
 
 	const not_null<Data::ForumTopic*> _topic;
+	const style::color &_generalIconFg;
 	Fn<bool()> _paused;
 	Fn<void()> _update;
 	std::shared_ptr<StickerPlayer> _player;