Exclude namespace prefix from tag name when comparing against field n…

…ames

This updates the "not_in" check that decides whether to pass a
new start tag within a struct to a $value field, to only consider
the local part of a QName. It now uses the same logic as the QNameDeserializer
that is used for keys/fields already to ensure they stay in sync.

Using the namespaced name in serde (i.e. `#[serde(rename = "ns1:tag")]`)
fails with ``Custom("missing field `ns1:tag`")`` today, so this will
not break existing code.

Co-authored-by: Xiphoseer <me@xiphoseer.de>

Changelog.md

@@ -40,6 +40,7 @@ to get an offset of the error position. For `SyntaxError`s the range
 - [#684]: Fix incorrect position reported for `Error::IllFormed(DoubleHyphenInComment)`.
 - [#684]: Fix incorrect position reported for `Error::IllFormed(MissingDoctypeName)`.
 - [#704]: Fix empty tags with attributes not being expanded when `expand_empty_elements` is set to true.
+- [#683]: Use local tag name when check tag name against possible names for field.
 
 ### Misc Changes
 
@@ -72,6 +73,7 @@ to get an offset of the error position. For `SyntaxError`s the range
 [#629]: https://github.com/tafia/quick-xml/issues/629
 [#675]: https://github.com/tafia/quick-xml/pull/675
 [#677]: https://github.com/tafia/quick-xml/pull/677
+[#683]: https://github.com/tafia/quick-xml/issues/683
 [#684]: https://github.com/tafia/quick-xml/pull/684
 [#689]: https://github.com/tafia/quick-xml/pull/689
 [#704]: https://github.com/tafia/quick-xml/pull/704

src/de/map.rs

@@ -789,7 +789,7 @@ fn not_in(
  start: &BytesStart,
  decoder: Decoder,
 ) -> Result<bool, DeError> {
- let tag = decoder.decode(start.name().into_inner())?;
+ let tag = decoder.decode(start.local_name().into_inner())?;
 
  Ok(fields.iter().all(|&field| field != tag.as_ref()))
 }