From e8b1cca662c2096697422e315e08a56716f4dd6a Mon Sep 17 00:00:00 2001
From: Robby Russell <robby@planetargon.com>
Date: Wed, 9 Sep 2026 08:12:33 -0700
Subject: [PATCH] fix(termsupport): set title correctly on terminals with
 parameterized tsl (#14052)

Co-authored-by: Fran Rogers <fran@violuma.net>
---
 lib/termsupport.zsh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/termsupport.zsh b/lib/termsupport.zsh
index 852a543c5..74dc3d25f 100644
--- a/lib/termsupport.zsh
+++ b/lib/termsupport.zsh
@@ -31,7 +31,12 @@ function title {
       else
         # Try to use terminfo to set the title if the feature is available
         if (( ${+terminfo[fsl]} && ${+terminfo[tsl]} )); then
-          print -Pn "${terminfo[tsl]}$1${terminfo[fsl]}"
+          # Emit the capabilities with echoti so terminfo does its own parameter
+          # substitution: some terminals (vt320) take a column argument, and
+          # running prompt expansion over the capability string mangles it.
+          echoti tsl 0
+          print -Pn "$1"
+          echoti fsl
         fi
       fi
       ;;