font-lock with make-indirect-buffer

[Martin Rudalics]

On GNU Emacs 21.3.50.1 (i386-mingw-windows98.3000) of 2005-01-30 on
NONIQPC I write the following variant of `clone-indirect-buffer':

(defun my-clone-buffer ()
  (interactive)
  (make-indirect-buffer 
    (current-buffer) (generate-new-buffer-name (buffer-name)) t))

I now open a larger file say `simple.el'.  Describing `font-lock-mode'
in buffer `simple.el' gets me: 

     font-lock-mode's value is t
     Local in buffer simple.el; global value is nil
     Automatically becomes buffer-local when set in any fashion.

     Non-nil if Font-Lock mode is enabled.
     Use the command `font-lock-mode' to change this variable.

     Defined in `font-core'.

I next do M-x my-clone-buffer which gets me a buffer say `simple.el<2>'.
I open `simple.el<2>', the mode-line says its in Emacs-Lisp mode hence
the major mode got inherited correctly.  However, font-lock has stopped
fontifying at the position where it left off in `simple.el' which leaves
me with a partially fontified `simple.el<2>'.
 
Describing `font-lock-mode' gets me

     font-lock-mode's value is t
     Local in buffer simple.el<2>; global value is nil
     Automatically becomes buffer-local when set in any fashion.

     Non-nil if Font-Lock mode is enabled.
     Use the command `font-lock-mode' to change this variable.

     Defined in `font-core'.

At this moment font-lock has also decided to stop any further
fontification of `simple.el'.

My Emacs 21.2 does not have such problems.