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def _merge_tags_if_possible(from_branch, to_branch, ignore_master=False,
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# Try hard to support merge_to implementations that don't expect
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# 'ignore_master' (new in bzr 2.3). First, if the flag isn't set then we
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# can safely avoid passing ignore_master at all.
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# If the flag is set, try to pass it, but be ready to catch TypeError.
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# Probably this implementation of 'merge_to' is from a plugin that
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# doesn't expect the 'ignore_master' keyword argument (e.g. bzr-svn