meta-alt-u unfolds lines at cursor

spec/app/editor-spec.coffee

@@ -2436,6 +2436,20 @@ describe "Editor", ->
 
         expect(editor.getCursorBufferPosition()).toEqual [3, 0]
 
+    describe "when a cursor is on a fold placeholder line", ->
+      it "removes the associated fold and places the cursor at its beginning", ->
+        editor.getSelection().setBufferRange(new Range([3, 0], [9, 0]))
+        editor.trigger 'fold-selection'
+
+        editor.setCursorBufferPosition([3,0])
+        editor.trigger 'unfold'
+
+        expect(editor.find('.fold')).not.toExist()
+        expect(editor.visibleLines.find('.line:eq(4)').text()).toMatch /4-+/
+        expect(editor.visibleLines.find('.line:eq(5)').text()).toMatch /5/
+
+        expect(editor.getCursorBufferPosition()).toEqual [3, 0]
+
   describe "editor-path-change event", ->
     it "emits event when buffer's path is changed", ->
       editor = new Editor

src/app/editor.coffee

@@ -119,6 +119,7 @@ class Editor extends View
       'redo': @redo
       'toggle-soft-wrap': @toggleSoftWrap
       'fold-selection': @foldSelection
+      'unfold': => @unfoldRow(@getCursorBufferPosition().row)
       'split-left': @splitLeft
       'split-right': @splitRight
       'split-up': @splitUp
@@ -681,6 +682,9 @@ class Editor extends View
 
   foldSelection: -> @getSelection().fold()
 
+  unfoldRow: (row) ->
+    @renderer.largestFoldForBufferRow(row)?.destroy()
+
   undo: ->
     if ranges = @buffer.undo()
       @setSelectedBufferRanges(ranges)

src/app/keymaps/editor.coffee

@@ -28,6 +28,7 @@ window.keymap.bindKeys '.editor',
   'meta-Z': 'redo'
   'alt-meta-w': 'toggle-soft-wrap'
   'alt-meta-f': 'fold-selection'
+  'alt-meta-u': 'unfold'
   'alt-meta-left': 'split-left'
   'alt-meta-right': 'split-right'
   'alt-meta-up': 'split-up'