utils.parse: fix ignore_ns in parse_xml #4075
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Fixes #4074
What's broken is the regex for removing the namespace data, which expects a leading space or tab character, which doesn't work when a new-line or a different whitespace character is used in the serialized XML content. I've added another test for that.
There's probably a better solution for stripping default namespace information than using a dirty regex substitution, but this simple fix should work for now (and I don't want to re-implement the parse_xml method).
https://lxml.de/parsing.html#parsers