mootools/mootools-core — pull request #2286 by arian (2012-02-09 21:39:35+00:00)
Title: Remove opacity filter in IE if the opacity is 1.

regression due b3e80ee15b to pass the added spec (which is disabled in this pr).

```
I did it, because it can have a: filter: alpha(opacity=50) in the CSS
so when you remove it with 1, it will be 0.5
was my reasoning..
but maybe remove it on 1 is better because it's pretty ugly when you fade from 0 to 1
```