Re: text properties

[Richard Stallman]

    Is it expected that evaluating this form sets `modified' flag
    of the current buffer even though fontifying by adding a hook
    by `jit-lock-register' does not?

            (add-text-properties 1 (1+ (buffer-size))
                                 '(face nil invisible nil))

Calling add-text-properties counts as modifying the buffer.