Hi,
I did some testing, and the bug was not in tracker as I suspected, it's in scrolltobottom, in erc-goodies.el. This should be much easier for you to debug: it's only a few lines long. I strongly suspect the part following this comment is responsible :
;; Temporarily bind resize-mini-windows to nil so that users who have it
;; set to a non-nil value will not suffer from premature minibuffer
;; shrinkage due to the below recenter call. I have no idea why this
;; works, but it solves the problem, and has no negative side effects.
;; (Fran Litterio, 2003/01/07)
Looks like it does have side effects after all :-)
2008/9/3 martin rudalics
<rudalics@gmx.at>
CC-ing Keegan because Bug #466 describes another problem with ERC and
windows.
>> There is a bug when using conjointly these two features. Here are the
>> relevant portions of configuration :
>>
>> ;;make ibuffer resize itself to its buffer size
>> (setq ibuffer-use-other-window t)
>> (setq ibuffer-default-shrink-to-minimum-size t)
>>
>> No specific configuration for erc, just enabling tracker is enough.
>> Then, run erc, and, in any erc buffer, call ibuffer. The screen
>> briefly flashes as an ERC window opens then disappears, and the
>> ibuffer window is reduced to a much smaller size than what it would be
>> outside ERC. I think the issue is erc's hook to
>> window-configuration-change somehow messing with ibuffer, but I'm not
>> experienced enough to find where the bug is.
Can't offer much insight but processing window-configuration-change
hooks has changed with Emacs 23. So this
(defun erc-track-modified-channels ()
"Hook function for `erc-insert-post-hook' to check if the current
buffer should be added to the modeline as a hidden, modified
channel. Assumes it will only be called when current-buffer
is in `erc-mode'."
(let ((this-channel (or (erc-default-target)
(buffer-name (current-buffer)))))
...
might have been broken for some reason. To verify, someone would have
to try with Emacs 22 and 23 inserting just before the `let' something
like
(unless (eq major-mode 'erc-mode)
(message "Not in erc-mode ..."))
and look whether it triggers.
martin