fix: conflict check when reference right is none (#40)

.cargo/config.toml

@@ -1,2 +1,5 @@
 [env]
 CARGO_WORKSPACE_DIR = { value = "", relative = true }
+
+[unstable]
+gc = true

y-octo/src/doc/codec/update.rs

@@ -466,6 +466,11 @@ mod tests {
             (include_bytes!("../../fixtures/database.bin").to_vec(), 1, 149),
             (include_bytes!("../../fixtures/large.bin").to_vec(), 1, 9036),
             (include_bytes!("../../fixtures/with-subdoc.bin").to_vec(), 2, 30),
+            (
+                include_bytes!("../../fixtures/edge-case-left-right-same-node.bin").to_vec(),
+                2,
+                243,
+            ),
         ];
 
         for (doc, clients, structs) in docs {

y-octo/src/doc/document.rs

@@ -608,4 +608,21 @@ mod tests {
             assert_eq!(&text.to_string(), "hello world");
         });
     }
+
+    #[test]
+    #[cfg_attr(any(miri, loom), ignore)]
+    fn test_apply_update() {
+        let updates = [
+            include_bytes!("../fixtures/basic.bin").to_vec(),
+            include_bytes!("../fixtures/database.bin").to_vec(),
+            include_bytes!("../fixtures/large.bin").to_vec(),
+            include_bytes!("../fixtures/with-subdoc.bin").to_vec(),
+            include_bytes!("../fixtures/edge-case-left-right-same-node.bin").to_vec(),
+        ];
+
+        for update in updates {
+            let mut doc = Doc::new();
+            doc.apply_update_from_binary_v1(&update).unwrap();
+        }
+    }
 }

y-octo/src/doc/store.rs

@@ -554,7 +554,6 @@ impl DocStore {
                             let mut right = right.get_mut_unchecked();
                             right.left = item_owner_ref.clone();
                         }
-                        this.right = right.clone();
                     } else {
                         // no right, parent.start = this, delete this.left
                         if let Some(parent_sub) = &this.parent_sub {
@@ -565,6 +564,7 @@ impl DocStore {
                             }
                         }
                     }
+                    this.right = right.clone();
 
                     let parent_deleted = parent.item.get().map(|item| item.deleted()).unwrap_or(false);