Resetting `whitespace-lines' face

[Philipp Stephani]

Hi,

when using the `lines' style in `whitespace-styles' there doesn't seem
to be a way to reapply the `whitespace-lines' face after changing the
`whitespace-line-column' variable.  That is, even turning
`whitespace-mode' off and on again doesn't change the line fontification
(because the font lock face is only added but never removed).  Is there
a way to force removing and adding the face?  (If so,
`whitespace-turn-off' should probably use it.)

Thanks,
Philipp

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