From d83a8eb35998f895143531318dd07c062cc6558e Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Thu, 11 Apr 2019 15:25:44 +0200
Subject: [PATCH] justify: correctly compute the number of lines to take, to
 avoid a crash

When the file starts with one or more blank lines, the first paragraph
doesn't start on line 1.

This fixes https://savannah.gnu.org/bugs/?56117.

Bug existed since version 4.0, commit ac8bd2a2.
---
 src/text.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/text.c b/src/text.c
index ccc41d46..39d61466 100644
--- a/src/text.c
+++ b/src/text.c
@@ -2070,7 +2070,7 @@ void do_justify(bool full_justify)
 
 		/* Set the number of lines to be pulled into the cutbuffer. */
 		if (full_justify)
-			jus_len = openfile->filebot->lineno;
+			jus_len = openfile->filebot->lineno - first_par_line->lineno + 1;
 		else
 			jus_len = par_len;