Support creating polls in RepliesSection.

Telegram/SourceFiles/window/section_widget.h

@@ -128,6 +128,10 @@ public:
 	virtual bool replyToMessage(not_null<HistoryItem*> item) {
 		return false;
 	}
+	[[nodiscard]] virtual MsgId currentReplyToIdFor(
+			not_null<History*> history) const {
+		return 0;
+	}
 
 	// Create a memento of that section to store it in the history stack.
 	// This method may modify the section ("take" heavy items).