highlight rule in every mode

[Joerg Sommer <joerg@xxxxxxxxxxxx>]

Hi,

is it possible to have an highlighting rule in every mode? I would like
to see trailing whitespaces everywhere. Do I need to patch every mode to
support trailing_whitespace?

Have a nice day, Jörg.
-- 
Je planmäßiger ein Mensch vorgeht,
desto stärker mag ihn der Zufall treffen.
		    Erich Krunau "Die Physiker"

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