[dev] PNG optimization for IE

[Vilius Šumskas]

Cituojama Jan Schneider <jan at horde.org>:

> Zitat von Jan Schneider <jan at horde.org>:
>
>> I'm not sure about the icons with the black background, but I guess these
>> had somehow a black background set when creating the transparency, it
>> should be possible to convert them to at least a white background if not to
>> indexed transparency and a transparent background.
>
> Most of the black icons (the ones from the tree/ folder) have just been
> fixed.

I looove this optimization. Thanks!

-- 
   Vilius