Re: Standalone info viewer parses some index entries incorrectly

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There's another bug that relates to this.

Using texi2any_internals.info again as the example, the proper index node i=
s
fine and works as expected but in a virtual index this same kind of entry i=
s
parsed incorrectly:

    info texi2any_internals -n Index

vs.

    info texi2any_internals --index-search xml_accent --all

It happens because when the virtual index is being created, the DEL charact=
ers
have already been stripped from the node name, which is printed as-is, so t=
here
isn't a quote character there for `scan_reference_label()` to stop scanning=
 at.

This is at info/indices.c:903.

Two diffs again--one makes `format_reference()` at that location enclose no=
de
names that have at least one colon in them in DEL characters. In order to u=
se
INFO_QUOTE_STR I moved it and INFO_QUOTE (seemed sensible to keep them toge=
ther) from
info/scan.c to info/scan.h.

The other diff updates the test I wrote previously to work with the now quo=
ted
index entry.


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