[ms]: Port a test to Solaris 11 sed.

* tmac/tests/s_TC-works-with-percent-in-custom-titles.sh: Put newlines
  after opening braces in sed scripts.  macOS and GNU sed tolerate their
  absence, but this sed does not.

* HACKING: Document this problem.

1 files changed, 5 insertions, 1 deletions

diff --git a/tmac/tests/s_TC-works-with-percent-in-custom-titles.sh b/tmac/tests/s_TC-works-with-percent-in-custom-titles.sh
index 53b90f85c..6939619e3 100755
--- a/tmac/tests/s_TC-works-with-percent-in-custom-titles.sh
+++ b/tmac/tests/s_TC-works-with-percent-in-custom-titles.sh
@@ -42,7 +42,11 @@ OUTPUT=$(echo "$EXAMPLE" | "$groff" -Tascii -P-cbou -ms)
 # test is the presence, adjacency, and ordering of non-blank lines.
 FILTERED_OUTPUT=$(echo "$OUTPUT" \
     | sed '/^$/d' \
-    | sed -n '/i/{N;/Table of Contents/{N;/Foo[. ][. ]*1/p;};}')
+    | sed -n '/i/{
+N;/Table of Contents/{
+N;/Foo[. ][. ]*1/p;
+};
+}')
 test -n "$FILTERED_OUTPUT"
 
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