Changes have been made in Git for this ticket:

Bug #4299: Fix dimming signatures when mixed with quoted text

http://git.horde.org/diff.php/framework/Text_Filter/lib/Horde/Text/Filter/Dimsignature.php?rt=horde-git&r1=a4821dba3cebdd907a36635ce22b9569ce35e32b&r2=85505a2a7397637aacfb9150f1b17d1a57618a7c
http://git.horde.org/diff.php/framework/Text_Filter/package.xml?rt=horde-git&r1=0a1dd0cd19b9adc33aea4d4f137b4d6b0aef4e8f&r2=85505a2a7397637aacfb9150f1b17d1a57618a7c

As far as I can tell, we need to combine some filter algorithms into a 
single call or else we will run into issues with improperly closed 
tags.  But this can't be done until Horde 4 since it will break BC.

Your issue is bogus.  The algorithim for dimming signatures recently 
changed from dimming everything below the first signature line to 
dimming everything below the last signature line.  It has nothing to 
do with quoted vs. unquoted.  The new algorithim makes more sense 
because it won't result in an entire message being dimmed if the 
signature appears on top.  Not to start a holy war, but it is 
definitely preferred etiquette to quote under previous text, so the 
user's signature should *always* appear at the bottom of the message.



However, your message does bring up another issue - namely, we 
shouldn't be dimming signatures in quoted text anyway if just for the 
simple fact we start mixing closed/unclosed div/span tags and the page 
won't render properly.  i.e., in this case, pseudocode looks like this:



<div class="quoted1">

<div class="quoted2">

  HTML

<span class="signature">

  Signature

</div>

</div>

</span>



This is a severe limitation with the current Text_Filter scheme since 
each filter doesn't (and can't) know if a previous filter has inserted 
div/span tags that may intersect the current text.  Yuck.



Possible solution - we have to do signature dimming in the highlight 
quote filter.  This would ensure we weren't setting a signature span 
across quoted div's.

With today's dimsignature changes in HEAD, my unquoted signature is no 
longer dim.  Quoted signatures are dim though.