From 97a21c13b9cf3b67b8f48a12f8578427e01d7a8b Mon Sep 17 00:00:00 2001
From: Oleksiy Syvokon <oleksiy@zed.dev>
Date: Tue, 17 Feb 2026 13:39:51 +0200
Subject: [PATCH] ep: Fix Unicode chars boundary (#49351)

Release Notes:

- N/A
---
 crates/edit_prediction_cli/src/format_prompt.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/edit_prediction_cli/src/format_prompt.rs b/crates/edit_prediction_cli/src/format_prompt.rs
index 113baf04d08e69912ef8d0f0005d24a82fa47998..702af3091a2d5f292806034ad875af861c484e2f 100644
--- a/crates/edit_prediction_cli/src/format_prompt.rs
+++ b/crates/edit_prediction_cli/src/format_prompt.rs
@@ -160,7 +160,7 @@ pub fn zeta2_output_for_patch(
         // We need to add where the hunk context matched in the editable region to compute
         // the actual cursor position in the result.
         let hunk_start = first_hunk_offset.unwrap_or(0);
-        let offset = (hunk_start + cursor_offset).min(result.len());
+        let offset = result.floor_char_boundary((hunk_start + cursor_offset).min(result.len()));
         result.insert_str(offset, zeta_prompt::CURSOR_MARKER);
     }