code: function updateThemes(cm) {
          var newTheme = prefs.get("theme"),
              cmTheme  = (cm.getOption("theme") || "").replace(/[\s]*/, ""); // Normalize themes string
  
          // Check if the editor already has the theme applied...
          if (cmTheme === newTheme) {
              return;
          }
  
          // Setup current and further documents to get the new theme...
          CodeMirror.defaults.theme = newTheme;
          cm.setOption("theme", newTheme);
      }
docs: Handles updating codemirror with the current selection of themes.
  
  @param {CodeMirror} cm is the CodeMirror instance currently loaded