NestedCommandsIrcProxy.reply tried to compute the length of
a message's overhead (':<prefix> <command> <target> :' and '\r\n'),
but because it doesn't exactly duplicate the code of _makeReply --
especially when computing the actual target -- it ends up slightly
off.
This commit moves the overhead length computation next to the
computation of the overhead itself, so it's always exact.
This will also allow message splitting in other methods without
duplicating the code too much.
echo-message ended up in self.state.capabilities_req even though it wasn't
requested, so the bot was stuck in state:
"Waiting for ACK/NAK of capabilities: {'echo-message'}".
Plugin can opt in to getting echo messages by setting the class attribute
'echo_message = True' if they want to get echos.
This defaults to False in order not to break existing plugins, and because
they usually don't need it (there's outFilter for most cases).
If on an insecure connection: reconnect.
If on a secure connect: store it and do nothing else.
For now, stored STS policies are not read when connecting to an
insecure server.
Fixes c1d3bad64feca2529e29473f0ed8c622ad1937b1, which crashed with:
```
ERROR 2020-01-18T01:34:07 Uncaught exception in NickAuth._callCommand:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/supybot/callbacks.py", line 1337, in _callCommand
irc.errorNoCapability(cap)
File "/usr/local/lib/python3.7/dist-packages/supybot/callbacks.py", line 544, in errorNoCapability
raise Error()
supybot.callbacks.Error
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/supybot/log.py", line 368, in m
return f(self, *args, **kwargs)
File "/usr/local/lib/python3.7/dist-packages/supybot/callbacks.py", line 1359, in _callCommand
irc.error(str(e))
File "/usr/local/lib/python3.7/dist-packages/supybot/callbacks.py", line 1065, in error
raise ArgumentError
supybot.callbacks.ArgumentError
```
It's nicer to use 'irc.channel' instead of 'irc.args[0]', and .channel
provides the actual channel name (stripped of the statusmsg prefix),
so it can be used by plugins when they want to use the actual channel
name.