Serde deserialization: Namespaces can lead to erroneous "duplicate field" errors

[roblabla]

There appears to be a bug when trying to deserialize XML mixing named and unnamed namespaces (e.g. xmlns=a and xmlns:a=a). Here's a quick repro, which I think shows the problem better than I can explain it:

#[test]
fn repro() {
    #[derive(Deserialize)]
    struct Root {
        lol: Vec<Lol>
    }

    #[derive(Deserialize)]
    struct Lol {}

    let x: Root = quick_xml::de::from_str(r#"<root>
        <lol xmlns="http://whatever.com/schema/whatever" />
        <ohai:lol xmlns:ohai="http://whatever.com/schema/whatever" />
    </root>"#).unwrap();
}

Output:

---- test::repro stdout ----
thread 'test::repro' panicked at 'called `Result::unwrap()` on an `Err` value: Custom("duplicate field `lol`")', src/lib.rs:163:179
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I would expect both lol and ohai:lol to get appended to the lol: Vec<Lol> of the Root struct.

[roblabla]

Changing TagFilter::is_suitable to compare local_name instead of the full name fixes my issue, though I'm not sure it's an acceptable general-purpose fix.

[Mingun]

Thanks for report, this is duplicate of #218