Undo change in xdisp.c in 2012-06-29T11:48:08Z!dmantipov@yandex.ru.

 src/xdisp.c (try_window_id): Undo last change.  'int' is wide 
 enough to hold vertical pixel positions on screen.

src/ChangeLog

 2012-06-29  Eli Zaretskii  <eliz@gnu.org>
 
+	* xdisp.c (try_window_id): Undo last change.
+
 	* w32.c (getwd): Adjust commentary about startup_dir.
 	(init_environment): Always call sys_access, even in non-MSVC
 	builds.  Don't chdir to the directory of the Emacs executable.

src/xdisp.c

@@ -17761,8 +17761,8 @@ try_window_id (struct window *w)
     {
       /* Displayed to end of window, but no line containing text was
 	 displayed.  Lines were deleted at the end of the window.  */
-      ptrdiff_t first_vpos = WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0;
-      ptrdiff_t vpos = XFASTINT (w->window_end_vpos);
+      int first_vpos = WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0;
+      int vpos = XFASTINT (w->window_end_vpos);
       struct glyph_row *current_row = current_matrix->rows + vpos;
       struct glyph_row *desired_row = desired_matrix->rows + vpos;