     pause_rendering: (immediate) =>
         if @_rendering_is_paused
             return
+        #console.log 'pause_rendering'
         @_rendering_is_paused = true
         if not @_render_buffer?
             @_render_buffer = ''

    unpause_rendering: () =>
        if not @_rendering_is_paused
            return
        @_rendering_is_paused = false
        f = () =>
            @render(@_render_buffer)

            # NOTE: we could do this on all keystrokes.  WE restrict as above merely for efficiency purposes.
            # See http://stackoverflow.com/questions/3902635/how-does-one-capture-a-macs-command-key-via-javascript
            @textarea.val('')
        if @_rendering_is_paused and not (ev.ctrlKey or ev.metaKey or ev.altKey)
            @unpause_rendering()

    _increase_font_size: () =>
