     return if @scrollViewMeasurementRequested
 
     @scrollViewMeasurementRequested = true
-    @requestAnimationFrame =>
+    requestAnimationFrame =>
       @scrollViewMeasurementRequested = false
       @measureScrollView()
 

    dragging = false
    lastMousePosition = {}
    animationLoop = =>
      @pauseScrollViewMeasurement()
      @requestAnimationFrame =>
        if dragging
          screenPosition = @screenPositionForMouseEvent(lastMousePosition)

      @clearMouseWheelScreenRowAfterDelay()

    unless animationFramePending
      @requestAnimationFrame =>
        {editor} = @props
        editor.setScrollTop(editor.getScrollTop() + @pendingVerticalScrollDelta)
