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phases: avoid N² behavior in `advanceboundary`...

phases: avoid N² behavior in `advanceboundary` We allowed duplicated entries in the deque, which each entry could potentially insert all its ancestors. So advancing boundary for the full repository would mean each revision would walk all its ancestors, resulting in O(N²) iteration. For repository of any decent size, N² is quickly insane. We introduce a simple set to avoid this and get back to reasonable performance.

Martin Geisler - - Load All Authors

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				Mercurial's documentation is kept in reStructuredText format, which is
				a simple plain text format that's easy to read and edit:

				http://docutils.sourceforge.net/rst.html

				It's also convertible to a variety of other formats including standard
				UNIX man page format and HTML. You'll need to install Docutils:

				http://docutils.sourceforge.net/

				Use the Makefile in this directory to generate the man and HTML pages.

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