Fixed #25170 -- Made SimpleTestCase.assertXMLEqual() ignore whitespace outside of tags.

[quamilek]

In every argument passed to compare_xml will be applied split() function.
All withespaces in the beginning and or end of xml string in assertXMLEqual will be ignored.

[timgraham]

The solution in #5049 seems a bit simpler. Do you see any behavioral differences between the two approaches?

[quamilek]

@timgraham, the solution in #5049 strip all element content. In my opinion this is not good behavior.
Element <elem>hello \n</elem> is not the same as <elem>hello</elem>. Fix in #5049 considers them as the same.
I add test to detect this situation: https://github.com/django/django/pull/5052/files#diff-f17eb660f85f373b64bc9765dc74a166R737

[mishunika]

@quamilek actually the removal of newlines inside is done not by my fix (i.e. the strip() function) but by the regex which is based on lxml.

[timgraham]

How about a case like this? I'd expect it to pass, but it doesn't.

    def test_simple_equal_with_whitespaces_multiple_elements(self):
        xml1 = "<elem>hello</elem><elem>hello</elem>"
        xml2 = " <elem>hello</elem> \t\n<elem>hello</elem>"
        self.assertXMLEqual(xml1, xml2)

[timgraham]

Closing due to inactivity. Please send a new PR if you update it, thanks!