When a snippet expansion is redone, tab stops are restored

spec/extensions/snippets-spec.coffee

@@ -160,6 +160,19 @@ describe "Snippets extension", ->
         editor.trigger keydownEvent('tab', target: editor[0])
         expect(buffer.lineForRow(0)).toBe "first line"
 
+    describe "when a snippet expansion is undone and redone", ->
+      it "recreates the snippet's tab stops", ->
+        editor.insertText '    t5\n'
+        editor.setCursorBufferPosition [0, 6]
+        editor.trigger keydownEvent('tab', target: editor[0])
+        expect(buffer.lineForRow(0)).toBe "    first line"
+        editor.undo()
+        editor.redo()
+
+        expect(editor.getCursorBufferPosition()).toEqual [0, 14]
+        editor.trigger keydownEvent('tab', target: editor[0])
+        expect(editor.getSelectedBufferRange()).toEqual [[1, 6], [1, 36]]
+
   describe ".loadSnippetsFile(path)", ->
     it "loads the snippets in the given file", ->
       spyOn(fs, 'read').andReturn """

src/extensions/snippets/snippet-expansion.coffee

@@ -54,3 +54,7 @@ class SnippetExpansion
   destroy: ->
     anchorRange.destroy() for anchorRange in @tabStopAnchorRanges
     @editSession.snippetExpansion = null
+
+  restoreTabStops: ->
+    @tabStopAnchorRanges = @tabStopAnchorRanges.map (anchorRange) =>
+      @editSession.addAnchorRange(anchorRange.getBufferRange())

src/extensions/snippets/snippets.coffee

@@ -29,9 +29,13 @@ module.exports =
       prefix = editSession.getLastCursor().getCurrentWordPrefix()
       if snippet = @snippetsByExtension[editSession.getFileExtension()][prefix]
         editSession.transact ->
-          editSession.snippetExpansion = new SnippetExpansion(snippet, editSession)
+          snippetExpansion = new SnippetExpansion(snippet, editSession)
+          editSession.snippetExpansion = snippetExpansion
           editSession.pushOperation
             undo: -> editSession.snippetExpansion.destroy()
+            redo: ->
+              editSession.snippetExpansion = snippetExpansion
+              snippetExpansion.restoreTabStops()
       else
         e.abortKeyBinding()