Follow-up Comment #8, bug #66332 (group groff): Hi Peter,
It's a syntax issue. Here's a diff that fixes it.
$ git diff
diff --git a/contrib/mom/om.tmac b/contrib/mom/om.tmac
index 70ec03b7b..c3da997fd 100644
--- a/contrib/mom/om.tmac
+++ b/contrib/mom/om.tmac
@@ -23880,7 +23880,7 @@ . defcolor pdf:href.colour rgb \\$1
. \}
. el \{\
\!. if !'\\*[pdf-img*caption\\*[short]]'' \
-\!. TO_FIGURES "\\*[pdf-img*caption\\*[short]]"
+. TO_FIGURES "\\*[pdf-img*caption\\*[short]]"
. \}
. \}
. if r IMG \{\
`\!`'s power to read until the end of the line is mighty, but it does
not overcome the meaning of the `\newline` escape sequence. The lines
were "logically" joined so what you got was equivalent to this:
\!. if !'\\*[pdf-img*caption\\*[short]]'' \!. TO_FIGURES
"\\*[pdf-img*caption\\*[short]]"
...meaning that the consequent of the `if` request, because it was
_already_ escaping from the current diversion, escaped from the _next
higher_ diversion--or straight to grout.
Confirmed with experiment.
$ ./build/test-groff -Z -mom ATTIC/66332.mom | sed -n '110,112p'
gropdf-info:href fig:1
n16158 0
V138474
H226000
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