old_contents: """
  Base config for tank.
  """
  
  from tiddlywebplugins.tank.wiki import (tank_uri, tank_tiddler_uri,
          tank_tiddler_resolver)
  
  config = {
      'extractors': ['tiddlywebplugins.oauth.extractor',
          'tiddlywebplugins.tank.extractor'],
      'auth_systems': ['tiddlywebplugins.tank.challenger'],
      'logged_in_redirect': '/dash',
      'wikitext.default_renderer': 'markdown',
      'wikitext.type_render_map': {
          'text/x-markdown': 'tiddlywebplugins.markdown'
      },
      'use_dispatcher': True,
      'links.at_means_bag': True,
      # Note: whoosher on beanstalk introduces latency issues
      'beanstalk.listeners': ['tiddlywebplugins.jsondispatcher'],
      'markdown.wiki_link_base': '',
      'markdown.interlinker': tank_uri,
      'markdown.transclude_url': tank_tiddler_uri,
      'markdown.target_resolver': tank_tiddler_resolver,
      'markdown.extensions': (['markdown_checklist.extension'], {}),
      'serializers': {
          'text/html': ['tiddlywebplugins.tank.htmlserialization',
              'text/html; charset=UTF-8']
      },
  }
  
new_contents: """
  Base config for tank.
  """
  
  from tiddlywebplugins.tank.wiki import (tank_uri, tank_tiddler_uri,
          tank_tiddler_resolver)
  
  config = {
      'extractors': ['tiddlywebplugins.oauth.extractor',
          'tiddlywebplugins.tank.extractor'],
      'auth_systems': ['tiddlywebplugins.tank.challenger'],
      'logged_in_redirect': '/dash',
      'wikitext.default_renderer': 'tiddlywebplugins.markdown',
      'wikitext.type_render_map': {
          'text/x-markdown': 'tiddlywebplugins.markdown'
      },
      'use_dispatcher': True,
      'links.at_means_bag': True,
      # Note: whoosher on beanstalk introduces latency issues
      'beanstalk.listeners': ['tiddlywebplugins.jsondispatcher'],
      'markdown.wiki_link_base': '',
      'markdown.interlinker': tank_uri,
      'markdown.transclude_url': tank_tiddler_uri,
      'markdown.target_resolver': tank_tiddler_resolver,
      'markdown.extensions': (['markdown_checklist.extension'], {}),
      'serializers': {
          'text/html': ['tiddlywebplugins.tank.htmlserialization',
              'text/html; charset=UTF-8']
      },
  }
  
subject: Fix default renderer config to be tiddlywebplugins.markdown