Follow-up Comment #3, bug #61025 (project groff):
And for those who enjoy their popcorn while watching arguments on the groff
mailing lists, we see here another example of ems being used to measure
vertical space.
diff --git a/tmac/e.tmac b/tmac/e.tmac
index 8a03b1c02..3317226bf 100644
--- a/tmac/e.tmac
+++ b/tmac/e.tmac
@@ -1971,6 +1971,7 @@
.
.nr $v \n(.v00+\n(.sp-1/\n(.sp \" vs as % of ps for .sz request
.nr $V \n($v \" same for displays & footnotes
+.nr $x 0.2m \" super/subscript line height increase
.nr hm 4v \" header margin
.nr tm 7v \" top margin
.nr bm 6v \" bottom margin
@@ -1992,22 +1993,22 @@
.nr ss 12p \" section prespacing
.nr si 0 \" section indent
.
+.@R 0x\" set by GNU pic to _disable_ \x in super/scripting
.
.\" *** OTHER INITIALIZATION ***
.
-.
-.\" GNU pic sets this register to 1 to indicate that \x should not be
-.\" used.
-.@R 0x
.\" Define strings for super- and subscripting. groff me does not
.\" bother with half-line motions in nroff mode, since we have no output
.\" driver (for that mode) that supports them; consequently we don't
.\" emit \x escape sequences in that case either. If someone implements
.\" a Model 37 or line printer emulator we can target, this decision
.\" could be revisited.
+.\"
+.\" Adjust the line height with \x if the `0x` register is zero (a
+.\" pic(1) convention) by the amount in `$x` (a groff 1.23 extension).
.ie t \
\{\
-.ds { \v'-0.4m'\x'\\n(0x=0*-0.2m'\s-3
+.ds { \v'-0.4m'\x'\\n(0x=0*-\\n($xu'\s-3
.ds } \s+3\v'0.4m'
.\}
.el \
@@ -2028,7 +2029,7 @@
.\}
.ie t \
\{\
-.ds < \v'0.4m'\x'\\n(0x=0*0.2m'\s-3
+.ds < \v'0.4m'\x'\\n(0x=0*\\n($xu'\s-3
.ds > \s+3\v'-0.4m'
.\}
.el \
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