Hidden messages and copying

[defanor]

When copying (kill-ring-saving) channel messages, the hidden with the "fool list" functionality messages also get copied if they are present between visible ones. It's rather surprising to see them after yanking in another buffer where buffer-invisibility-spec is not set to hide those. Actually, seems like they also become visible when yanking into the same channel's prompt.

Perhaps filter-buffer-substring-function should be set to cut those messages out if they are not visible at the time of copying.

[jorgenschaefer]

Sounds good to me :-)