bug#56885: Fix url-about.el in EWW or make it obsolete

[Po Lu]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> The harm is that we have to maintain it.

I didn't see any maintenance happening, yet it still worked.  Had Stefan
not gone out of his way to find it, we would not even be having this
discussion right now.

I tend to find that whether or not a piece of obscure old code in Emacs
works doesn't depend on how much maintenance it gets, but what state it
was in when it was first installed.

Case in point: the OffiX and old KDE code in x-dnd.el, which nobody
uses, has existed without changes for a comparable amount of time, and
still worked perfectly when it was tested several months ago.  However,
the XDND and Motif code has always had serious bugs that were only fixed
in the past few months, despite being actively maintained.

Or the entire NS port, which despite active maintenance (and use by a
large amount of people) could not display mouse-highlight and italic
text correctly.  The MS-DOS port in Emacs 28.1 is in a much better state
compared to the NS port, despite work on it being limited to biennial
build fixes.

> If it's useless (and this patently is, since it hasn't worked probably
> in decades

It has worked fine since it was installed in 2002.  eww came after.

> and nobody has complained

I am now.

> So I'm now doing that.

Why?  As I already said, there _is_ a use for it.  Is there another way
to obtain information about supported URL schemes, their ports,
services, and the proxies that apply to them, all in a single page?