Cursor.moveCursorToBeginningOfNextWord() behaves correctly on whitespace

Closes #669

spec/app/edit-session-spec.coffee

@@ -427,6 +427,14 @@ describe "EditSession", ->
         expect(cursor2.getBufferPosition()).toEqual [1, 13]
         expect(cursor3.getBufferPosition()).toEqual [2, 4]
 
+        # When the cursor is on whitespace
+        editSession.setText("ab cde- ")
+        editSession.setCursorBufferPosition [0,2]
+        cursor = editSession.getCursor()
+        editSession.moveCursorToBeginningOfNextWord()
+
+        expect(cursor.getBufferPosition()).toEqual [0, 3]
+
       it "does not blow up when there is no next word", ->
         editSession.setCursorBufferPosition [Infinity, Infinity]
         endPosition = editSession.getCursorBufferPosition()

src/app/cursor.coffee

@@ -128,6 +128,11 @@ class Cursor
     range = [[row, Math.min(0, column - 1)], [row, Math.max(0, column + 1)]]
     /^\s+$/.test @editSession.getTextInBufferRange(range)
 
+  isInsideWord: ->
+    {row, column} = @getBufferPosition()
+    range = [[row, column], [row, Infinity]]
+    @editSession.getTextInBufferRange(range).search(@wordRegExp()) == 0
+
   # Removes the setting for auto-scroll.
   clearAutoscroll: ->
     @needsAutoscroll = null
@@ -370,7 +375,7 @@ class Cursor
   # Returns a {Range}.
   getBeginningOfNextWordBufferPosition: (options = {}) ->
     currentBufferPosition = @getBufferPosition()
-    start = if @isSurroundedByWhitespace() then currentBufferPosition else @getEndOfCurrentWordBufferPosition()
+    start = if @isInsideWord() then @getEndOfCurrentWordBufferPosition() else currentBufferPosition
     scanRange = [start, @editSession.getEofBufferPosition()]
 
     beginningOfNextWordPosition = null