font-lock-maximum-size

[Chong Yidong]

  font-lock-maximum-size is a variable defined in `font-lock.el'.
  Its value is 256000

  Documentation:
  Maximum size of a buffer for buffer fontification.
  Only buffers less than this can be fontified when Font Lock mode is
  turned on.

Looks like this variable doesn't work, and hasn't worked for a long
time.  It nothing when JIT lock mode is in use, and since fast-lock and
lazy-lock are obsolete, it's pretty useless.  (Anyway, source files
larger than 250K are not uncommon.)

If there are no objections, I am going to mark it as deprecated, and
remove it from the manual.