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From: Javier <invalid@invalid.invalid>
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Subject: Re: changing the display of formfeed characters
Date: Tue, 4 Sep 2018 06:43:36 +0000 (UTC)
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It turns out that the code I have just wrote works fine when called
interactively

M-x global-whitespace-formfeed-mode

but if I write this in ~/.emacs

(global-whitespace-newline-mode 1)

enables the whole of whitespace-mode, with spaces and newlines
highlighted, not just formfeed.