Emphasized lines are not styled

[mrelbe1]

Emphasized lines in line listings are not styled:

Example:

.. code-block:: batch  
   :linenos:  
   :emphasize-lines: 3  

   @echo off  

   set WORKSPACES=C:\path\to\workspace  

   for /d %%s in (%WORKSPACES%\*) do (  
       rem Do something  
       )

Renders like this:

It's really hard to read the highlighted lines.

PR with a proposal is on its way.