>> When redisplay merges faces a face `nil' won't have any effect on the
>> previous face. `default' will override the previous face with the
>> default face.
> In cases like
> (add-text-properties start end (list 'face face-variable))
> either `nil' or `default' will override the previous face.
But if the text is shown in the mode-line or the header-line, the face
`default' overrides the "default" `mode-line' or `header-line' face, whereas
nil preserves it.
Stefan
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