On Thu, 2004-09-16 at 21:00, Stefan wrote:
> > Perhaps there could be a new keyword :propertize-default that changes
> > the text properties of only those characters in the string that do not
> > already have a value for any of the specified properties.  Or maybe this
> > should be the behavior of :propertize.
> 
> I think it makes sense to change the behavior of `:propertize' here.

It turns out that the existing code already tries to merge the existing
properties of the string with the properties specified in :propertize,
but it doesn't work in this case for two reasons:

- the code gets the existing properties just by looking at the first
character of the string; in my case the first character is a space which
doesn't have any properties, i.e. my code does

	 (concat " "
		 (propertize "Invalid"
			     'help-echo "mouse-1: go to first error"
			     'local-map (make-mode-line-mouse-map
					 'mouse-1
					 'rng-mouse-first-error)))

- the code gives the new properties priority over the existing
properties

Attached is a patch that 

- when the first character has no properties, gets the properties from
the last character;

- gives priority to the existing properties over the new properties.

James
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