Run RTL CSS urls through the style_loader_src filter
|Reported by:||nbachiyski||Owned by:|
Currently, if the rtl extra data for a stylesheet is set to true, its URL isn't generated by _css_href(), which applies the style_loader_src filter. Instead, the RTL URL is generated by the URL of the main stylesheet with .css replaced with -rtl.css.
Here is a patch, which properly gets the RTL URL using _css_href().