mozilla-b2g/gaia — pull request #3794 by RudyLu (2012-08-24 12:05:30+00:00)
Title: Make keyboard overlay able to work on homescreen

To fix Issue #3754.

Now, the z-index would be,

1. When homescreen is shown,
homescreen > keyboard iframe
so that the button on homescreen could be clicked.

2. When homescreen is not active,
homescreen < keyboard iframe, so keyboard iframe will cover homescreen when it is shown for key input.