changeset diff view shows encoded quotes

http://bitbucket.org/alu/hgtasks/changeset/e8ceef3e7e5d/#chg-hgext/tasks.py_oldline20

it seems to only do it for the first quote in the line,

• {{ {"}

  }} becomes {{

  {"}

  }}

• {{ {'}

  }} becomes {{

  {'}

  }}