[bug #63354] Refine fallbacks.tmac

[Dave]

Follow-up Comment #33, bug #63354 (group groff):

Bjarni's proposed \[u2012] definition in comment #26 has two problems.
* It relies on a register (lfiguredash) that calculates the width of a zero
and a hair space based on the font size at the time the register is defined. 
This value will thus be incorrect at any other font size used later in the
document.
* It emits an extraneous apostrophe.  This input:

.nr lfiguredash \w'0'u-(2*\w'\^'u)
.char \[u2012] \^\v'-0.3m'\D'l \n[lfiguredash]u 0m'\v'0.3m\^'
.rm lfiguredash
.
1\[u2012]2\[u2012]3

produces the attached typeset output.

(file #55773)

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Additional Item Attachment:

File name: figuredash.png                 Size:0 KB
    <https://file.savannah.gnu.org/file/figuredash.png?file_id=55773>


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