[bug #63354] Refine fallbacks.tmac

[Dave]

Follow-up Comment #2, bug #63354 (project groff):

One of my examples in the [comment #0 original submission] doesn't do what I
thought it did.

$ cat ellipsis_demo
.nf
Switch to a font without u2026, and remove the Symbol fallback.
.ft ZD
.special
\[u2026]\[u2026]\[u2026]
$ groff -Z ellipsis_demo | fgrep font
x font 5 TR
tfont
x font 11 S

I had intended for the ".special" line to zero out the list of special fonts,
based on this sentence in the "Special Fonts" section of the manual: "Previous
calls to 'special' or 'fspecial' are overwritten; without arguments, the
particular list of special fonts is set to empty."

But the grout output shows that the Symbol font is still being invoked.  (And,
notably, ZD is not, since after the request to switch to ZD, the input file
asks only for one glyph, which ZD doesn't have.)

I opened bug #63366 to report the documentation issue.  As that bug report
points out, there doesn't seem to be a way for a document to remove Symbol as
a special font.  So to get this example to show what I intended it to show, I
may have to remove the S font description file from the system.  Further
research is required.


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