Fix attribute splitting into items when deserialize into list and decode is required

Changelog.md

@@ -30,12 +30,15 @@
 ### Bug Fixes
 
 - [#806]: Properly normalize EOL characters in `Deserializer`.
+- [#888]: Properly split attribute values by items when deserialize attribute into
+  list of values and attribute requires decoding.
 
 ### Misc Changes
 
 [#806]: https://github.com/tafia/quick-xml/issues/806
 [#878]: https://github.com/tafia/quick-xml/pull/878
 [#882]: https://github.com/tafia/quick-xml/pull/882
+[#888]: https://github.com/tafia/quick-xml/pull/888
 
 
 ## 0.38.0 -- 2025-06-28

src/de/simple_type.rs

@@ -430,7 +430,8 @@ impl<'de, 'a> SeqAccess<'de> for ListIter<'de, 'a> {
                         // Skip additional bytes if we own data for next iteration, but deserialize from
                         // the borrowed data from our buffer
                         Content::Owned(s, skip) => {
-                            let item = s.split_at(skip + end).0;
+                            let rest = s.split_at(skip).1;
+                            let item = rest.split_at(end).0;
                             let result = seed.deserialize(AtomicDeserializer {
                                 content: CowRef::Slice(item),
                                 escaped: self.escaped,

tests/serde-issues.rs

@@ -674,3 +674,38 @@ fn issue868() {
         ),
     }
 }
+
+/// Regression test for https://github.com/tafia/quick-xml/pull/888.
+#[cfg(feature = "encoding")]
+#[test]
+fn issue888() {
+    #[derive(Debug, PartialEq, Deserialize)]
+    struct Root {
+        #[serde(rename = "@list")]
+        list: Vec<String>,
+    }
+
+    let xml = r#"
+        <?xml version="1.0" encoding="windows-1251"?>
+        <root list="текст требующий декодирования"/>"#;
+
+    let (xml, enc, _) = dbg!(encoding_rs::WINDOWS_1251.encode(xml));
+    assert_eq!(
+        enc,
+        encoding_rs::WINDOWS_1251,
+        "windows-1251 should be used for the test"
+    );
+
+    let data: Root = quick_xml::de::from_reader(xml.as_ref()).unwrap();
+    assert_eq!(
+        data,
+        Root {
+            list: vec![
+                // Translation from Russian:
+                "текст".to_string(),         // text
+                "требующий".to_string(),     // that-requires
+                "декодирования".to_string(), // decoding
+            ],
+        }
+    );
+}