UIComponent tag (attn: Manfred Geiler)

[Simon Kitching]

Hi Manfred,

A long time ago class UIComponentTag was altered so that "_id", 
"_binding" and "_rendered" were only cleared in release, not in 
internalRelease.

Commit r166747 (by "manolito") indicates that it was something to do 
with Resin. I believe manolito is you...

Do you have any more info about this? There isn't any actual bug caused 
by this AFAIK, but it does seem very odd not to reset these fields even 
when the tag is going to be reused by the container. It would be nice to 
document exactly *why* this is needed.

Thanks,

Simon