rails/rails — pull request #7360 by evanfarrar (2012-08-16 00:37:15+00:00)
Title: Remove leading divider from grouped_options_for_select when divider option is passed

This will omit the first divider in grouped_options_for_select (I would
expect a divider to go between things only).

Currently, the grouped options divider will make a select like so:

Please Select:
-----
USA
Canada
-----
Denmark
United Kingdom
-----
China
India

It is more symmetric and more typical to only seperate the groups:

Please Select:

USA
Canada
-----
Denmark
United Kingdom
-----
China
India