patch 8.0.0299: a window resize is sometimes not taking effect

Problem:    When the GUI window is resized Vim does not always take over the
            new size. (Luchr)
Solution:   Reset new_p_guifont in gui_resize_shell().  Call
            gui_may_resize_shell() in the main loop.

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    299,
 /**/
     298,
 /**/