Add This Community tab to message search scopes

Telegram/SourceFiles/dialogs/dialogs_key.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "dialogs/dialogs_key.h"
 
+#include "data/data_channel.h"
 #include "data/data_folder.h"
 #include "data/data_forum_topic.h"
 #include "data/data_saved_sublist.h"
@@ -92,9 +93,13 @@ PeerData *Key::peer() const {
 }
 
 ChatSearchTab SearchState::defaultTabForMe() const {
+	const auto history = inChat.history();
+	const auto channel = history ? history->peer->asChannel() : nullptr;
 	return inChat.topic()
 		? ChatSearchTab::ThisTopic
-		: (inChat.history() || inChat.sublist())
+		: (channel && channel->isCommunity())
+		? ChatSearchTab::ThisCommunity
+		: (history || inChat.sublist())
 		? ChatSearchTab::ThisPeer
 		: inChat.folder()
 		? ChatSearchTab::Archive