Restore markers before triggering buffer events

This allows folds to be restored on undo/redo

spec/app/display-buffer-spec.coffee

@@ -265,9 +265,10 @@ describe "DisplayBuffer", ->
         changeHandler.reset()
 
       describe "when the old range surrounds a fold", ->
-        it "removes the fold and replaces the selection with the new text", ->
+        beforeEach ->
           buffer.change([[1, 0], [5, 1]], 'party!')
 
+        it "removes the fold and replaces the selection with the new text", ->
           expect(displayBuffer.lineForRow(0).text).toBe "0"
           expect(displayBuffer.lineForRow(1).text).toBe "party!"
           expect(displayBuffer.lineForRow(2).fold).toBe fold2
@@ -275,6 +276,13 @@ describe "DisplayBuffer", ->
 
           expect(changeHandler).toHaveBeenCalledWith(start: 1, end: 3, screenDelta: -2, bufferDelta: -4)
 
+        describe "when the changes is subsequently undone", ->
+          it "restores destroyed folds", ->
+            buffer.undo()
+            expect(displayBuffer.lineForRow(2).text).toBe '2'
+            expect(displayBuffer.lineForRow(2).fold).toBe fold1
+            expect(displayBuffer.lineForRow(3).text).toBe '5'
+
       describe "when the old range surrounds two nested folds", ->
         it "removes both folds and replaces the selection with the new text", ->
           displayBuffer.createFold(2, 9)

src/app/buffer-change-operation.coffee

@@ -19,6 +19,7 @@ class BufferChangeOperation
     @options ?= {}
 
   do: ->
+    @buffer.pauseEvents()
     @pauseMarkerObservation()
     @oldText = @buffer.getTextInRange(@oldRange)
     @newRange = @calculateNewRange(@oldRange, @newText)
@@ -29,10 +30,12 @@ class BufferChangeOperation
       oldText: @oldText
       newText: @newText
     @restoreMarkers(@markersToRestoreOnRedo) if @markersToRestoreOnRedo
+    @buffer.resumeEvents()
     @resumeMarkerObservation()
     newRange
 
   undo: ->
+    @buffer.pauseEvents()
     @pauseMarkerObservation()
     @markersToRestoreOnRedo = @invalidateMarkers(@newRange)
     @changeBuffer
@@ -41,6 +44,7 @@ class BufferChangeOperation
       oldText: @newText
       newText: @oldText
     @restoreMarkers(@markersToRestoreOnUndo)
+    @buffer.resumeEvents()
     @resumeMarkerObservation()
 
   splitLines: (text) ->