code: def _updateViewer(self, force=False):
          
          if not force and not self.viewer_dialog.isVisible():
              return
          # default text if nothing is found
          path = self.purrer.indexfile
          mtime = self.fileModTime(path)
          # return if file is older than our content
          if mtime and mtime <= (self._viewer_timestamp or 0):
              return
          busy = BusyIndicator()
          self.viewer_dialog.setDocument(path, empty=
          "<P>Nothing in the log yet. Try adding some log entries.</P>")
          self.viewer_dialog.reload()
          self.viewer_dialog.setLabel("""<P>Below is your full HTML-rendered log. Note that this is 
        only a bare-bones viewer, so only a limited set of links will work. 
        For a fully-functional view, use a proper HTML browser to look at the index file residing here:<BR>
        <tt>%s</tt></P>
        """ % self.purrer.indexfile)
          self._viewer_timestamp = mtime
docs: Updates the viewer dialog.
          If dialog is not visible and force=False, does nothing.
          Otherwise, checks the mtime of the current purrer index.html file against self._viewer_timestamp.
          If it is newer, reloads it.