Three things the first cut got wrong by being global when it had no business
being.
The modeline entry was added to `mode-line-misc-info' at load. It returns nil
outside a Flan buffer, so it was invisible — but it was still evaluated on
every redisplay of every buffer in the session, for someone who loads the
client and then spends the afternoon in dired. It is installed buffer-locally
by `flan-dev-setup' now, which already runs in exactly the buffers that want
it. The `derived-mode-p' guard stays: cheap, and it keeps the function honest
wherever it is called from.
`flan-dev-setup' switched eldoc on. Contributing a documentation source is
this file's business; whether eldoc runs at all is the user's, and turning it
on overrules someone who has `global-eldoc-mode' off deliberately. It is on by
default, so nearly everyone gets the same behaviour either way.
And a reconnect forgot the name cache without asking for it again. An empty
cache is honest but silent — eldoc goes quiet, M-. falls through to whatever
else is registered, and nothing says why — until the next install happens to
refill it. It refreshes straight after reconnecting, which is safe from there
because the connection is live by that point and the request does not come
back round through the same function.
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