Wrong frame with recent trunk [MSYS2-MinGW64]

[Angelo Graziosi]

With recent trunk (say rev. >= r117564), my MSYS2-mingw64 (Win7 64) 
Emacs builds show a strange behaviour : each time I start Emacs, the 
frame is 2 line shorter in height. For example if I start with a frame 
of 36 line, the next start it is 34, then 32, etc.

I can reproduce this with this minimal init.el [*]

$ cat /c/Users/pippo/AppData/Roaming/.emacs.d/init.el
;; Instead to save in ~/.emacs.desktop
(setq desktop-base-file-name "~/.emacs.d/desktop")

;; Instead to save in ~/.emacs.desktop.lock
(setq desktop-base-lock-name "~/.emacs.d/desktop.lock")

;; Save desktop
(desktop-save-mode t)


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[*] From Emacs-Windows point of view, "~" is 
"/c/Users/pippo/AppData/Roaming" (on Win7)