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Commit 7798242

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QuLogicQuLogic
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Fix SVG histogram example.
`Element.getchildren` was removed in Python 3.9, but more importantly, blindly picking the first subelement is completely broken since we added metadata to SVG. Using XPath finds the `style` tag wherever it might be.
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‎examples/user_interfaces/svg_histogram_sgskip.py

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""" % json.dumps(hist_patches)
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# Add a transition effect
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css = tree.getchildren()[0][0]
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css = tree.find('.//{http://www.w3.org/2000/svg}style')
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css.text = css.text + "g {-webkit-transition:opacity 0.4s ease-out;" + \
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"-moz-transition:opacity 0.4s ease-out;}"
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