[Seaside] [ENH] WAForm to prevent degradation of rendered images

[Brent Pinkney]

> This would be very useful, but - what degree of caching does it do?

> Does it cache the PNG data in the image?

Its #asMimeDocument method is very similar to Form's - except it can  
twiddle the ImageReadWrite subclass to instanciate as it is aware of the  
mime content type.

It does NOT read from the file after it has been instanciated - you will  
know more about whether that constitutes caching :)

> And does it allow the browser to cache the image on the client side
> (by having equal WAForm objects be #= to each other so that they get the  
> same URL)?

It didn't but the attached version does. Tested in Opera and Firefox.

Regards

Brent
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