Merge tag 'v0.22.4'

release v0.22.4

src/event/FullyBufferedSocket.hxx

@@ -48,6 +48,10 @@ public:
 		BufferedSocket::Close();
 	}
 
+	std::size_t GetOutputMaxSize() const noexcept {
+		return output.max_size();
+	}
+
 private:
 	/**
 	 * @return the number of bytes written to the socket, 0 if the