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smartset: use native set operations as fast paths...

smartset: use native set operations as fast paths For set operations like "&" and "-", where we know both basesets have their sets ready, and the first set is sorted, use the native Python set operations as a fast path. Note: "+" is not optimized as that will break the ordering. This leads to noticeable improvements on performance: revset | before | after | delta ---------------------------------------------------------------- draft() & draft() & draft() & draft() | 776 | 477 | -39% draft() + draft() + draft() + draft() | 2849 | 2864 | draft() - draft() + draft() - draft() | 943 | 240 | -75% draft() - draft() - draft() - draft() | 557 | 197 | -64% (time measured in microseconds)

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        $ rm -rf a

        $ hg init a

        $ cd a

        $ echo a > a

        $ hg ci -Am0

        adding a

        $ hg tag t1 # 1

        $ hg tag --remove t1 # 2

        $ hg co 1

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        $ hg tag -f -r0 t1

        $ hg tags

        tip                                3:a49829c4fc11

        t1                                 0:f7b1eb17ad24

        $ cd ..

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				$ rm -rf a
				$ hg init a
				$ cd a
				$ echo a > a
				$ hg ci -Am0
				adding a
				$ hg tag t1 # 1
				$ hg tag --remove t1 # 2

				$ hg co 1
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				$ hg tag -f -r0 t1
				$ hg tags
				tip 3:a49829c4fc11
				t1 0:f7b1eb17ad24

				$ cd ..