Dialog: Extract check for which elements can gain focus into its own method for overriding. Fixes #9087 - Dialog: Allow registering elements outside a dialog for use when a modal dialog is open.
Dialog: Extract check for which elements can gain focus into its own method for overriding. Fixes #9087 - Dialog: Allow registering elements outside a dialog for use when a modal dialog is open.

GrayYoung/jQuery.UI.Extension,GrayYoung/jQuery.UI.Extension