Add a plain text man page test file & fix sed portability

nbase wants the } after a compound command separate from the last
command.

Makefile-testfiles

@@ -400,6 +400,10 @@ type1.vhd:
 	VBoxManage createmedium disk --filename=type1.vhd --format=VHD --sizebyte=163840
 	VBoxManage closemedium type1.vhd
 
+type1.man: type1.1
+	# type1.1 is lightly-edited version of testfiles/type1.1
+	nroff -man -c "$^" >"$@"
+
 # It's best to use a version of dar <= 2.7.0 to create this file to avoid test
 # failures due to an archive created by a too-new version of dar.
 type1.1.dar: foo

autodescribe

@@ -1053,9 +1053,9 @@ comment_man () {
 
 # File type: mantxt (plain text version of man page)
 comment_mantxt () {
-	COMMENT=$(sed -n -Ee '/^(N.NA.AM.ME.E|NAME)$/{N;s/^[^ ]* *//p}' < "$f" | head -1)
+	COMMENT=$(sed -n -Ee '/^(N.NA.AM.ME.E|NAME)$/{N;s/^[^ ]* *//p' -e '}' < "$f" | head -1)
 	if [ -z "$COMMENT" ] ; then
-		# It might be bin in roff format if it's not in plain ASCII format
+		# It might be in roff format if it's not in plain ASCII format
 		comment_man "$@"
 	fi
 }

test-autodescribe-expected

@@ -36,6 +36,7 @@
 'testfiles/type1.kra' 'Krita name'
 'testfiles/type1.lsm' 'LSM Title'
 'testfiles/type1.lzh' 'LZH comment in desc.sdi file'
+'testfiles/type1.man' 'fileviewinfotest - plain text man page name'
 'testfiles/type1.md' 'Markdown title'
 'testfiles/type1.metainfo.xml' 'Nonlocalized name, Nonlocalized summary'
 'testfiles/type1.mlt' 'video.mp4'

testfiles/type1.man

@@ -0,0 +1,16 @@
+FILEVIEWINFOTEST(1)         General Commands Manual        FILEVIEWINFOTEST(1)
+
+
+
+NNAAMMEE
+       fileviewinfotest - plain text man page name
+
+SSYYNNOOPPSSIISS
+       ffiilleevviieewwiinnffootteesstt
+
+DDEESSCCRRIIPPTTIIOONN
+       Test input file.
+
+
+
+fileviewinfo test file            23 Nov 2023              FILEVIEWINFOTEST(1)