font-lock-unfontify-region-function

font-lock-unfontify-region-function is a variable defined in `font-lock.el'.
Its value is

font-lock-default-unfontify-region

• This variable may be risky if used as a file-local variable.

Documentation:
Function to use for unfontifying a region.
It should take two args, the beginning and end of the region.
This is normally set via `font-lock-defaults'.