Proposed change to modifier.truncate.php to respect HTML entities

I'm using the truncate modifier in my templates to truncate user-defined 
output which can contain HTML entities.  I need truncate to respect HTML 
entities so that it calculates the length correctly and doesn't split on 
HTML entity boundaries.

I chose to create a new modifier based on the truncate modifier which 
does the equivalent of html_entity_decode() on the input string, then 
does the truncate calculation, then does an htmlentities() on the result 
before returning it.  This is perhaps not the most efficient approach, 
but it is simple in the code (and I am not particularly concerned about 
efficiency in this case).

It would be easy for me to make this an optional behaviour in the 
standard truncate modifier, preserving its existing API.  If I were to 
do that and provide a patch, would it be accepted?  If not, is there an 
alternate approach you'd prefer to get the same results?

thanks,
-Bharat

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