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Fix sample.

Jose Fonseca authored on 01/12/2018 16:59:12
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@@ -41,7 +41,7 @@ class MyDotWindow(xdot.DotWindow):
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         return True
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-dotcode = """
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+dotcode = b"""
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 digraph G {
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   Hello [URL="http://en.wikipedia.org/wiki/Hello"]
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   World [URL="http://en.wikipedia.org/wiki/World"]