Fade animations should take IE cleartype issues into account

[malsup]

Minor changes to jQuery's fade animations will help mitigate rendering issues with IE when clearType is enabled. A possible solution can be found here:

 http://www.malsup.com/jquery/fadetest.html

[gpk]

Note that there's an interesting alternative workaround - # 2 here  http://mattberseth.com/blog/2007/12/ie7_cleartype_dximagetransform.html. As well as giving a smoother overall animation, it is also of use with fadeTo and animate when the final opacity is not 1. But relys on being able to overlay the original element with another div, so won't always be applicable. Would be great to have it available as an option though.

[geckoneer]

yes, that would be nice to have such a workaround

[snover]

Duplicate of #6652.