From 963456830c345654ecd0f4e51d6c8b9caa62f7ec Mon Sep 17 00:00:00 2001
From: Dongdong Zhou <dz@yay.com>
Date: Thu, 3 Mar 2022 12:25:02 +0000
Subject: [PATCH] fix jump to nearest delta

---
 core/src/editor.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/core/src/editor.rs b/core/src/editor.rs
index 42156c48..fd063a47 100644
--- a/core/src/editor.rs
+++ b/core/src/editor.rs
@@ -980,6 +980,17 @@ fn jump_to_nearest_delta(&mut self, delta: &RopeDelta) {
         let offset = transformer.transform(offset, false);
         let (ins, del) = delta.clone().factor();
         let ins = ins.transform_shrink(&del);
+        for el in ins.els.iter() {
+            match el {
+                xi_rope::DeltaElement::Copy(b, e) => {
+                    // if b == e, ins.inserted_subset() will panic
+                    if b == e {
+                        return;
+                    }
+                }
+                xi_rope::DeltaElement::Insert(_) => {}
+            }
+        }
         let mut positions = ins
             .inserted_subset()
             .complement_iter()