bug#53981: 28.0.91; shortdoc: Add support for outline-minor-mode

[Lars Ingebrigtsen]

Daniel Mendler <mail@daniel-mendler.de> writes:

> With this setting, the separator line generally looks better and less
> obtrusive. So we may want to consider using no background and
> `:underline t` instead? With outline mode folding the separator line is
> still visible, but doesn't disturb the visuals so severely.

I think the separator line looks fine the way it is, so if we're to
enable outline-minor-mode in that buffer, the outlining will have to be
adjusted to take that into account.

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