Make frame synchronization a frame parameter

* doc/lispref/frames.texi (Management Parameters): Document
`use-frame-synchronization'.
* etc/NEWS: Update entry.

* src/frame.c (frame_parms): New frame parameter
`use-frame-synchronization'.
(syms_of_frame): New defsym.
* src/haikufns.c (haiku_frame_parm_handlers):
* src/nsfns.m (ns_frame_parm_handlers):
* src/pgtkfns.c (pgtk_frame_parm_handlers):
* src/w32fns.c (w32_frame_parm_handlers): Update frame param
handlers correctly.
* src/xfns.c (x_set_use_frame_synchronization): New function.
(Fx_create_frame): Set default value of said parameter.
(x_frame_parm_handlers): Add handler.

* src/xterm.c (x_sync_wait_for_frame_drawn_event): Clear
parameter if sync fails.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/pgtkfns.c b/src/pgtkfns.c
index d998c3d938c..beaf28f69d9 100644
--- a/src/pgtkfns.c
+++ b/src/pgtkfns.c
@@ -991,6 +991,7 @@ frame_parm_handler pgtk_frame_parm_handlers[] =
     pgtk_set_override_redirect,
     gui_set_no_special_glyphs,
     pgtk_set_alpha_background,
+    NULL,
   };