Allow editing topic title and icon.

Telegram/SourceFiles/info/info_controller.h

@@ -7,16 +7,18 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
-#include <rpl/variable.h>
 #include "data/data_search_controller.h"
 #include "window/window_session_controller.h"
 
+namespace Data {
+class ForumTopic;
+} // namespace Data
+
 namespace Ui {
 class SearchFieldController;
 } // namespace Ui
 
-namespace Info {
-namespace Settings {
+namespace Info::Settings {
 
 struct Tag {
 	explicit Tag(not_null<UserData*> self) : self(self) {
@@ -25,23 +27,27 @@ struct Tag {
 	not_null<UserData*> self;
 };
 
-} // namespace Settings
+} // namespace Info::Settings
 
-namespace Downloads {
+namespace Info::Downloads {
 
 struct Tag {
 };
 
-} // namespace Downloads
+} // namespace Info::Downloads
+
+namespace Info {
 
 class Key {
 public:
-	Key(not_null<PeerData*> peer);
+	explicit Key(not_null<PeerData*> peer);
+	explicit Key(not_null<Data::ForumTopic*> topic);
 	Key(Settings::Tag settings);
 	Key(Downloads::Tag downloads);
 	Key(not_null<PollData*> poll, FullMsgId contextId);
 
 	PeerData *peer() const;
+	Data::ForumTopic *topic() const;
 	UserData *settingsSelf() const;
 	bool isDownloads() const;
 	PollData *poll() const;
@@ -54,6 +60,7 @@ private:
 	};
 	std::variant<
 		not_null<PeerData*>,
+		not_null<Data::ForumTopic*>,
 		Settings::Tag,
 		Downloads::Tag,
 		PollKey> _value;