Re: emacs rendering comparisson between emacs23 and emacs26.3

[martin rudalics]

> It stops when it gets to a buffer position where the
> 'fontified' text property changes its value.  If the new value of
> 'fontified' is nil, the display engine calls fontification-functions.
> jit-lock adds its function to that hook, so jit-lock is called.  What
> jit-lock does, in a nutshell, is call the current buffer's
> fontification function(s) on a chunk of text starting at the position
> for which it was called, and it puts on that chunk a value of t for
> the 'fontified' text property.  (Where that chunk ended is the
> position where the 'fontified' property's value will again change to
> nil, and if that position is inside the window, jit-lock will be
> called again when the display engine gets to that position.)  After
> fontification-functions return, the display engine processes the faces
> in the chunk that has been fontified; then it continues marching
> through the buffer.

IIRC fontification can also modify text before the position where the
'fontified' property changed to nil.  Or is that wrong?

martin