🚀 go-pugleaf

I finally got fed up with Emacs' "intelligent" screen updating.  If you
have several repeated patterns in the file you are editing, then a C-v
will cause Emacs to (as much as possible) reuse what is already on the
screen rather than just send out the data another time.  I don't know
about all machines available, but I don't have any X terminals that can
scroll data around faster than they can receive new data.  (Pretty sad,
isn't it?)  Any way, on my Sun 3/160, it took a full *five* seconds to
do a C-v in a particular file.  I dug into the sources and found the
following in scroll.c, line 342.

	/* Put new lines' hash code in hash table  */
	for (i = start; i < end; i++)
	  {
	    if (cost[i] > 20)
	      {
		h = newhash[i] & 0777;

If you change the 20 to a 200, then the intelligent updating will be
disabled.  Perhaps this should be a parameter settable at runtime.  It
really means how short a line must be before it is worth simply sending
it out rather than copying it from another part of the screen.  My
change says that any line less than 200 characters should simply be
redrawn rather than copied.

Tim