From 42ae05b08230ef8fbd48e14bd948182857411ba3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6ran=20Karl?=
 <3951388+JoeKar@users.noreply.github.com>
Date: Fri, 24 May 2024 20:19:55 +0200
Subject: [PATCH] backup: Lock the buffer lines in `Backup()`

---
 internal/buffer/backup.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/internal/buffer/backup.go b/internal/buffer/backup.go
index 62e692db..8d6997f0 100644
--- a/internal/buffer/backup.go
+++ b/internal/buffer/backup.go
@@ -82,6 +82,9 @@ func (b *Buffer) Backup() error {
 	name := filepath.Join(backupdir, util.EscapePath(b.AbsPath))
 
 	err = overwriteFile(name, encoding.Nop, func(file io.Writer) (e error) {
+		b.Lock()
+		defer b.Unlock()
+
 		if len(b.lines) == 0 {
 			return
 		}