Let us assume I have registered a function as fontification in a buffer named foo.
With jit-lock-mode:
(jit-lock-register #'(lambda (start end)
(message "Jit!")))
From another buffer, I would like to force that fontification function (and all registered fontification functions).
I am using the function font-lock-flush, in the following:
(with-current-buffer "foo"
(font-lock-flush))
Without any success.
That is, when I evaluate (with-current-buffer "foo"...) in a buffer different from foo, no message is printed.
I would expect that expression forces the anonymous function registered as fontification in buffer foo. Instead, the function is not invoked -- I don't see any message in the *Message* buffer.
Additional Notes
I have also tried other functions to force, such as: jit-lock-fontify-now. Still, no message is printed.
Simply, open two buffer: foo and bar.
The content of foo:
(jit-lock-register #'(lambda (start end)
(message "Jit!")))
And evaluate the buffer.
Now, every time the buffer needs to be fontified a message ("Jit!" will be printed).
Instead, the content of the buffer bar:
(with-current-buffer "foo"
(font-lock-flush)) ;; or jit-lock-fontify-now
Evaluate (from the buffer bar) that expression.
You should notice no message is printed, despite the fact that expression should force the fontification inside foo.
jit-lock-refontify is a compiled Lisp function in ‘jit-lock.el’.
(jit-lock-refontify &optional BEG END)
Force refontification of the region BEG..END (default whole buffer).
Experimentally, this does what you want:
(with-current-buffer "foo"
(jit-lock-refontify))