Re: Undo-limit default

[Chong Yidong]

Chong Yidong <address@hidden> writes:

> Could you check whether stripping out the font-lock information has any
> bad effects?  The following untested patch should implement this
> behavior:

Whoops, too untested :-P

Try this patch instead:

*** trunk/src/undo.c.~1.86.~    2008-09-24 23:23:04.000000000 -0400
--- trunk/src/undo.c    2008-12-07 10:05:52.000000000 -0500
***************
*** 60,65 ****
--- 60,69 ----
  
  int undo_inhibit_record_point;
  
+ /* Text properties not recorded in the undo list.  */
+ 
+ Lisp_Object Vundo_discarded_text_properties;
+ 
  /* Record point as it was at beginning of this command (if necessary)
     and prepare the undo info for recording a change.
     PT is the position of point that will naturally occur as a result of the
***************
*** 174,179 ****
--- 178,187 ----
    if (EQ (current_buffer->undo_list, Qt))
      return;
  
+   Fremove_text_properties (make_number (0), make_number (SCHARS (string)),
+                          Vundo_discarded_text_properties,
+                          string);
+ 
    if (PT == beg + SCHARS (string))
      {
        XSETINT (sbeg, -beg);
***************
*** 734,739 ****
--- 742,757 ----
    DEFVAR_BOOL ("undo-inhibit-record-point", &undo_inhibit_record_point,
               doc: /* Non-nil means do not record `point' in 
`buffer-undo-list'.  */);
    undo_inhibit_record_point = 0;
+ 
+   DEFVAR_LISP ("undo-discarded-text-properties", 
&Vundo_discarded_text_properties,
+              doc: /* Text properties not recorded in the undo list.
+ This should be a property list whose property names specify the
+ properties to remove.  (The values stored in the property list are
+ ignored.)  */);
+   Vundo_discarded_text_properties
+     = list4 (intern ("fontified"), Qnil,
+            intern ("jit-lock-defer-multiline"), Qnil);
+   staticpro (&Vundo_discarded_text_properties);
  }
  
  /* arch-tag: d546ee01-4aed-4ffb-bb8b-eefaae50d38a