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.
diff --git a/src/version.c b/src/version.c
index 93a59cd..fa51e56 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    299,
+/**/
     298,
 /**/
     297,