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Fix #3754: HTML builder crashes if HTML theme appends own stylesheets
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@ -13,6 +13,8 @@ Features added
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Bugs fixed
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----------
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* #3754: HTML builder crashes if HTML theme appends own stylesheets
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Testing
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--------
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@ -121,6 +121,7 @@ class CSSContainer(list):
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RemovedInSphinx20Warning)
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for item in other:
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self.append(item)
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return self
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def __add__(self, other):
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ret = CSSContainer(self)
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