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diff -up firefox-78.2.0/python/mozbuild/mozbuild/controller/building.py.mach-fail firefox-78.2.0/python/mozbuild/mozbuild/controller/building.py
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--- firefox-78.2.0/python/mozbuild/mozbuild/controller/building.py.mach-fail	2020-09-09 19:25:18.552930506 +0200
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+++ firefox-78.2.0/python/mozbuild/mozbuild/controller/building.py	2020-09-09 19:25:31.081010223 +0200
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@@ -591,7 +591,7 @@ class TerminalLoggingHandler(logging.Han
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             if self.footer:
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                 self.footer.clear()
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-            self.fh.write(msg.encode("utf-8"))
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+            self.fh.write(msg)
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             self.fh.write('\n')
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             if self.footer: