CKReleaser should properly compress filters in CSS files

[Wiktor Walc]

IE needs a comma after each filter. The following does not work:

filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='icons.png',sizingMethod='scale'),alpha(opacity=30);}

This one is ok (note: space after comma before alpha):

filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='icons.png',sizingMethod='scale'), alpha(opacity=30);

Dirt hack comitted with [6231]. Ideally it should be fixed in yuicompressor.

Related issues:

• if we move two filters into two separate CSS rules, #4821 will be back.
• if there is no space before alpha(), #6857 appears in release version of CKEditor 3.5

[Wiktor Walc]

Ops, it looks like this hack should be ported to CKBuilder. Kama skin in IE8 with zoom enabled looks bad again: