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From: Javier <invalid@invalid.invalid>
Newsgroups: gmane.emacs.help
Subject: Re: changing the display of formfeed characters
Date: Tue, 4 Sep 2018 06:50:45 +0000 (UTC)
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The same thing happens in vanilla emacs with the modes defined in whitespace.el

M-x global-whitespace-newline-mode

works fine interactively (only highlights newlines), but if I write in ~/.emacs

(global-whitespace-newline-mode 1)

It highlights spaces and tabs, not just newlines.