[bug #66122] [mom] but for `BoxStop`, package is `-wall`-clean

[Bjarni Ingi Gislason]

Follow-up Comment #3, bug #66122 (group groff):

  A line length needs only to be changed if the register for it is defined.

  Code with 'if r ...' is common in the source.

  Following is a local change:

Date:   Mon Oct 4 23:45:27 2021 +0000

    contrib/mom/om.tmac: only set line length with 'pdfbx-pre-ll' if defined
+verbose+
diff --git a/contrib/mom/om.tmac b/contrib/mom/om.tmac
index 70792bfff..4dbbf4699 100644
--- a/contrib/mom/om.tmac
+++ b/contrib/mom/om.tmac
@@ -24448,13 +24448,13 @@ No room to start \\*[MN-pos] margin note
#\\n[MN-curr] on page \\n[#P].
 .   \}
 .   if \\n[#IR_ACTIVE] \{\
 .     nr #R_INDENT \\n[#IR_ACTIVE]
-.     ll \\n[pdfbx-pre-ll]u
+.     if r pdfbx-pre-ll .ll \\n[pdfbx-pre-ll]u
 .     IR
 .     rr pdfbx-pre-ll
 .     rr #IR_ACTIVE
 .   \}
 .   if \\n[#IBR_ACTIVE] \{\
-.     ll \\n[pdfbx-pre-ll]u
+.     if r pdfbx-pre-ll .ll \\n[pdfbx-pre-ll]u
 .     IB \\n[#IBL_ACTIVE]u \\n[#IBR_ACTIVE]u
 .     rr pdfbx-pre-ll
 .     rr #IBR_ACTIVE

-verbose-


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