From 8f43dc40398ff8372b1612241081926bac6d2055 Mon Sep 17 00:00:00 2001
From: Nathan Vegdahl <cessen@cessen.com>
Date: Fri, 23 Jul 2021 17:52:45 -0700
Subject: [PATCH] Fix surround replace command replacing the wrong position on
 the right.

---
 helix-term/src/commands.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 57df47a77..ca977f808 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -3738,8 +3738,11 @@ fn surround_replace(cx: &mut Context) {
                     let transaction = Transaction::change(
                         doc.text(),
                         change_pos.iter().enumerate().map(|(i, &pos)| {
-                            let ch = if i % 2 == 0 { open } else { close };
-                            (pos, pos + 1, Some(Tendril::from_char(ch)))
+                            if i % 2 == 0 {
+                                (pos, pos + 1, Some(Tendril::from_char(open)))
+                            } else {
+                                (pos.saturating_sub(1), pos, Some(Tendril::from_char(close)))
+                            }
                         }),
                     );
                     doc.apply(&transaction, view.id);