Re: 'M-o' ('facemap-keymap') has now been removed until March 10th 2021

[Gregory Heytings]

> > - with a prefix argument, toggle font-lock-mode "correctly" (i.e. 
> > making sure that the buffer is unfontified when disabling)
>
> This part is what shouldn't be in there. Calling 
> `font-lock-unfontify-region' is the nuclear option to remove all text 
> properties, including those that font lock doesn't "own", so to speak.

Does it?  AFAICS, font-lock-unfontify-region does not "remove _all_ text 
properties", it uses remove-list-of-text-properties, which "removes _some_ 
properties from text", namely those of font-lock-mode.