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RE: How can I remove effects of text properties in 'before-string

From: Drew Adams
Subject: RE: How can I remove effects of text properties in 'before-string
Date: Sun, 22 Oct 2017 09:33:08 -0700 (PDT)

> > (set-window-margins (get-buffer-window) 20 0)
> > (overlay-put (make-overlay (point) (point)) 'before-string
> > (propertize "." 'display `((margin left-margin) ,"Hi there!")))
> > (hl-line-mode)
> >
> > The string "Hi there!" is also highlighted. How can I disable
> > that?
> Give the string a distinct face.

Why doesn't it use the `default' face?  If no `face'
property is given to the string, why would the effective
face be something different from `default'?

Where in the doc do we say that this should use a face
that is used in an overlay placed on some buffer positions?

Is this behavior documented?  I couldn't find anything
about it, but it might well be there somewhere.  I looked
in the doc about overlays and the doc about the margin,
but perhaps it is there and I overlooked or misread it.

Or is this perhaps a bug?  For what reason should the
properties of an overlay on some parts of a buffer
affect the appearance of the margin?

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