Tokenize empty lines with a changed indent level synchronously

src/tokenized-buffer.coffee

@@ -157,32 +157,29 @@ class TokenizedBuffer extends Model
     end = oldRange.end.row
     delta = newRange.end.row - oldRange.end.row
 
-    @invalidateSurroundingChangedWhitespaceRows(start, end)
     @updateInvalidRows(start, end, delta)
     previousEndStack = @stackForRow(end) # used in spill detection below
     newTokenizedLines = @buildTokenizedLinesForRows(start, end + delta, @stackForRow(start - 1))
     _.spliceWithArray(@tokenizedLines, start, end - start + 1, newTokenizedLines)
-    newEndStack = @stackForRow(end + delta)
 
+    start = @retokenizeWhitespaceRowsIfIndentLevelChanged(start - 1, -1)
+    end = @retokenizeWhitespaceRowsIfIndentLevelChanged(newRange.end.row + 1, 1) - delta
+
+    newEndStack = @stackForRow(end + delta)
     if newEndStack and not _.isEqual(newEndStack, previousEndStack)
       @invalidateRow(end + delta + 1)
 
     @emit "changed", { start, end, delta, bufferChange: e }
 
-  invalidateSurroundingChangedWhitespaceRows: (startRow, endRow) ->
-    # Indent levels might change when something else in the buffer changes.
-    # If they do, invalidate those rows.
-    @invalidateChangedWhitespaceRows(startRow - 1, -1)
-    @invalidateChangedWhitespaceRows(endRow + 1, 1)
-
-  invalidateChangedWhitespaceRows: (row, increment) ->
+  retokenizeWhitespaceRowsIfIndentLevelChanged: (row, increment) ->
     line = @tokenizedLines[row]
-    if line?.isOnlyWhitespace() and @indentLevelForRow(row) != line.indentLevel
+    if line?.isOnlyWhitespace() and @indentLevelForRow(row) isnt line.indentLevel
       while line?.isOnlyWhitespace()
-        @invalidateRow(row)
+        @tokenizedLines[row] = @buildTokenizedTokenizedLineForRow(row, @stackForRow(row - 1))
         row += increment
         line = @tokenizedLines[row]
-    return
+
+    row - increment
 
   buildTokenizedLinesForRows: (startRow, endRow, startingStack) ->
     ruleStack = startingStack