Replace SelectedItemSet with MessageIdsList.

Use vector<FullMsgId> everywhere instead QMap<..,HistoryItem*>.
The old way the app crashed in case some messages were deleted.
If the items are needed use HistoryItemsList=vector<HistoryItem*>.

Telegram/SourceFiles/boxes/peer_list_controllers.cpp

@@ -892,7 +892,7 @@ void AddBotToGroupBoxController::prepareViewHook() {
 }
 
 ChooseRecipientBoxController::ChooseRecipientBoxController(
-	base::lambda<void(not_null<PeerData*>)> callback)
+	base::lambda_once<void(not_null<PeerData*>)> callback)
 : _callback(std::move(callback)) {
 }