angular-ui/bootstrap — pull request #717 by manikantag (2013-07-27 09:07:00+00:00)
Title: added support for separate backdrop for each instance of dialog

This change will add a separate backdrop element with incremental
`z-index` for each instance of dialog and removes the corresponding
backdrop on dialog close. This is especially useful when dialogs are
launched from with in another dialog.

*We've tested this on our project and working fine.*