Make "new sentence, new line" detection stricter:

Also catch cases where the new sentence starts with a one-letter word
and the input line is broken right after that word.
Suggested by Thomas Klausner <wiz @ NetBSD>.

It's merely a three-bit diff, changing one byte from 0x34 to 0x33,
so what can possibly go wrong...

1 files changed, 1 insertions, 1 deletions

diff --git a/mdoc.c b/mdoc.c
index 3bdec3db..23a661be 100644
--- a/mdoc.c
+++ b/mdoc.c
@@ -278,7 +278,7 @@ mdoc_ptext(struct roff_man *mdoc, int line, char *buf, int offs)
 	for (c = buf + offs; c != NULL; c = strchr(c + 1, '.')) {
 		if (c - buf < offs + 2)
 			continue;
-		if (end - c < 4)
+		if (end - c < 3)
 			break;
 		if (isalpha((unsigned char)c[-2]) &&
 		    isalpha((unsigned char)c[-1]) &&