Ensure redisplay using variable watcher

This replaces looking up the variable name in redisplay--variables when
setting it.

* lisp/frame.el: Replace redisplay--variables with add-variable-watcher
calls.
* src/xdisp.c (Fset_buffer_redisplay): Rename from maybe_set_redisplay,
set the redisplay flag unconditionally.
(Vredisplay__variables): Remove it.
* src/data.c (set_internal): Remove maybe_set_redisplay call.

1 files changed, 0 insertions, 2 deletions

diff --git a/src/data.c b/src/data.c
index 095b740c1b2..81846b5dcbc 100644
--- a/src/data.c
+++ b/src/data.c
@@ -1275,8 +1275,6 @@ set_internal (Lisp_Object symbol, Lisp_Object newval, Lisp_Object where,
     default: emacs_abort ();
     }
 
-  maybe_set_redisplay (symbol);
-
  start:
   switch (sym->redirect)
     {