Another related problem (fixing one will probably fix the other, but I'm posting just in case) : doing the same manipulation resets the count of unseen messages
2008/9/2 Chong Yidong
<cyd@stupidchicken.com>
Hi guys,
Could you take a look at this bug report? I'm not sure whether ERC or
ibuffer needs fixing.
> 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.