Use setImmediate to batch all editor updates, even in animation frames

When I was using nextTick to batch updates, there were issues with
flicker. So I was attempting to always update synchronously in animation
frames, which was complicated. setImmediate doesn't cause the flicker
however, so I'm able to remove the special logic for sync updates in
animation frames and just use it across the board.

src/editor-component.coffee

@@ -25,8 +25,6 @@ EditorComponent = React.createClass
   pendingScrollTop: null
   pendingScrollLeft: null
   selectOnMouseMove: false
-  updatesPaused: false
-  updateRequestedWhilePaused: false
   updateRequested: false
   cursorsMoved: false
   selectionChanged: false
@@ -205,23 +203,13 @@ EditorComponent = React.createClass
     @remeasureCharacterWidthsIfNeeded(prevState)
 
   requestUpdate: ->
-    if @updatesPaused
-      @updateRequestedWhilePaused = true
-    else
-      if @performSyncUpdates ? EditorComponent.performSyncUpdates
-        @forceUpdate()
-      else unless @updateRequested
-        @updateRequested = true
-        process.nextTick =>
-          @updateRequested = false
-          @forceUpdate() if @isMounted()
-
-  requestAnimationFrame: (fn) ->
-    requestAnimationFrame =>
-      @updatesPaused = true
-      fn()
-      @updatesPaused = false
-      @forceUpdate() if @updateRequestedWhilePaused
+    if @performSyncUpdates ? EditorComponent.performSyncUpdates
+      @forceUpdate()
+    else unless @updateRequested
+      @updateRequested = true
+      setImmediate =>
+        @updateRequested = false
+        @forceUpdate() if @isMounted()
 
   getRenderedRowRange: ->
     {editor, lineOverdrawMargin} = @props
@@ -522,7 +510,7 @@ EditorComponent = React.createClass
     animationFramePending = @pendingScrollTop?
     @pendingScrollTop = scrollTop
     unless animationFramePending
-      @requestAnimationFrame =>
+      requestAnimationFrame =>
         @props.editor.setScrollTop(@pendingScrollTop)
 
   onHorizontalScroll: (scrollLeft) ->
@@ -533,7 +521,7 @@ EditorComponent = React.createClass
     animationFramePending = @pendingScrollLeft?
     @pendingScrollLeft = scrollLeft
     unless animationFramePending
-      @requestAnimationFrame =>
+      requestAnimationFrame =>
         @props.editor.setScrollLeft(@pendingScrollLeft)
         @pendingScrollLeft = null
 
@@ -554,7 +542,7 @@ EditorComponent = React.createClass
       @clearMouseWheelScreenRowAfterDelay()
 
     unless animationFramePending
-      @requestAnimationFrame =>
+      requestAnimationFrame =>
         {editor} = @props
         editor.setScrollTop(editor.getScrollTop() + @pendingVerticalScrollDelta)
         editor.setScrollLeft(editor.getScrollLeft() + @pendingHorizontalScrollDelta)