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From: Chong Yidong <cyd@stupidchicken.com>
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Subject: Re: tool bar icons not updated according to :active condition
Date: Fri, 24 Feb 2006 10:23:38 -0500
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> In `gnus-group-make-tool-bar' the describe-group entry is also added
> to the tool bar (icon: etc/images/gnus/describe-group.xpm):
>
>   (tool-bar-add-item-from-menu
>     'gnus-group-describe-group "describe-group" gnus-group-mode-map)
>
> But after moving up/down in the group buffer (C-p/C-n), the icon is
> not updated (enabled/disabled) when changing from a group to a topic
> line and vice versa.
>
> After `C-l' (or after `redraw-frame' [3]), the correct icon is
> displayed.  A workaround could be to redraw the frame after every
> point-motion (is there a after-point-motion-hook?).

You could use post-command-hook.