More explicitly require throttle_done() only for _queued_lines

src/IRCBot.py

@@ -268,7 +268,8 @@ class Bot(object):
                         self.log.warn(
                             "Disconnected from %s, reconnecting in %d seconds",
                             [str(server), reconnect_delay])
-                elif (server.socket.waiting_send() and
+                elif server.socket.waiting_immediate_send() or (
+                        server.socket.waiting_send() and
                         server.socket.throttle_done()):
                     self.register_both(server)
 

src/IRCSocket.py

@@ -153,6 +153,8 @@ class Socket(IRCObject.Object):
 
     def waiting_send(self) -> bool:
         return bool(len(self._write_buffer)) or bool(len(self._queued_lines))
+    def waiting_immediate_send(self) -> bool:
+        return bool(len(self._write_buffer))
 
     def throttle_done(self) -> bool:
         return self.send_throttle_timeout() == 0