yui/yui3 — pull request #762 by jinty (2013-05-17 12:10:26+00:00)
Title: Stop unconditionally setting the z-index on sync

This causes a bug where hidden widgets set the z-index of the mask
to their own z-index. The mask z-index is anyway correctly set
previously in _uiSetHostVisibleModal.

You can test this bug manually with this code:

```html

```