What to do when font-lock-flush + font-lock-ensure do less than font-lock-fontify-buffer?

[Clément Pit--Claudel]

Hi emacs-devel,

IIUC the proper way in Emacs 25 to signal changes that require a 
refontification to font-lock is to call font-lock-flush. This doesn't always do 
as much as font-lock-fontify-buffer does, though.

In particular, when the font-lock-fontified variable is nil (which does happen, 
though I don't know why; I don't know what this variable is for), then calling 
font-lock-fontify buffer does refontify the whole buffer, but font-lock-flush 
and font-lock-ensure don't seem to do anything.

What's the proper way to mark a buffer for refontification (and refontify the 
visible portion) immediately in 25?

Thanks,
Clément.

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