[issue13127] xml.dom.Attr.name is not labeled as read-only

[Giovanni Cappellotto]

Giovanni Cappellotto <potomak84 at gmail.com> added the comment:

In https://github.com/python/cpython/pull/14757 I tried updating the implementation of `Attr._set_name` to remove and reset the attr node in the owner element. So now `Attr._set_name` behaves similarly to `Document.renameNode`.

All existing tests are still passing and I added one more test for checking the issue described here.

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<https://bugs.python.org/issue13127>
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