From 7d0b7e47c11a340ce1bb5bec6303583dbd73b106 Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Fri, 28 Feb 2020 17:02:34 +0100
Subject: [PATCH] undo: use the correct original fusion point when unjoining
 two lines

When a <Backspace> did the join, 'head' and 'tail' are not the same.

This fixes https://savannah.gnu.org/bugs/?57916.

Bug existed since commit 7cf08b93 from yesterday.
---
 src/text.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/text.c b/src/text.c
index ad071506..09b7330c 100644
--- a/src/text.c
+++ b/src/text.c
@@ -556,7 +556,7 @@ void do_undo(void)
 			goto_line_posx(openfile->filebot->lineno, 0);
 			break;
 		}
-		line->data[u->head_x] = '\0';
+		line->data[u->tail_x] = '\0';
 		intruder = make_new_node(line);
 		intruder->data = copy_of(u->strdata);
 		splice_node(line, intruder);