[RFC] vim-patch:7.4.325

This is another ostensibly GUI-related change that seems worth including because it helps robustness.

---

Problem:    When starting the gui and changing the window size the status line
            may not be drawn correctly.
Solution:   Catch new_win_height() being called recursively. (Christian
            Brabandt)

https://code.google.com/p/vim/source/detail?r=1f288d247548
There should be two spaces before `//`