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bug#6344: 24.0.50; doc of menu separators

From: Drew Adams
Subject: bug#6344: 24.0.50; doc of menu separators
Date: Wed, 13 Jul 2011 15:43:58 -0700

> > I just spent some time myself rediscovering this.
> > Can we please fix the doc to mention this?  Thx.
> >
> >> A user will naturally wonder, "Is there no way to specify 
> >> :enable or :visible for a menu separator?"  In fact, there
> >> is a way, simply use:
> >>  (menu-item SEPARATOR-TYPE nil :visible PREDICATE)
> >> etc.
> >>  
> >> In sum, the doc (spec) for separators is incomplete.
> Could you suggest an appropriate text for the manual?

I think all we need to say is something like this (in node `Menu Separators'):

You can use this longer form to specify keywords such as :enable and :visible
for a menu separator:


For example:

  (menu-item "--" nil :visible (boundp 'foo))

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