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strip: incrementally update the branchheads cache after a strip...

strip: incrementally update the branchheads cache after a strip This function augments strip to incrementally update the branchheads cache rather than recompute it from scratch. This speeds up the performance of strip and rebase on repos with long history. The performance optimization only happens if the revisions stripped are all on the same branch and the parents of the stripped revisions are also on that same branch. This adds a few test cases, particularly one that reproduces the extra heads that mpm observed.

Mads Kiilerich - - Load All Authors

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      http://mercurial.selenic.com/bts/issue1877

        $ hg init a

        $ cd a

        $ echo a > a

        $ hg add a

        $ hg ci -m 'a'

        $ echo b > a

        $ hg ci -m'b'

        $ hg up 0

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

        $ hg book main

        $ hg book

         * main                      0:cb9a9f314b8b

        $ echo c > c

        $ hg add c

        $ hg ci -m'c'

        created new head

        $ hg book

         * main                      2:d36c0562f908

        $ hg heads

        changeset:   2:d36c0562f908

        bookmark:    main

        tag:         tip

        parent:      0:cb9a9f314b8b

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     c

        changeset:   1:1e6c11564562

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     b

        $ hg up 1e6c11564562

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

        $ hg merge main

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

        (branch merge, don't forget to commit)

        $ hg book

           main                      2:d36c0562f908

        $ hg ci -m'merge'

        $ hg book

           main                      2:d36c0562f908

        $ cd ..

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				http://mercurial.selenic.com/bts/issue1877

				$ hg init a
				$ cd a
				$ echo a > a
				$ hg add a
				$ hg ci -m 'a'
				$ echo b > a
				$ hg ci -m'b'
				$ hg up 0
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				$ hg book main
				$ hg book
				* main 0:cb9a9f314b8b
				$ echo c > c
				$ hg add c
				$ hg ci -m'c'
				created new head
				$ hg book
				* main 2:d36c0562f908
				$ hg heads
				changeset: 2:d36c0562f908
				bookmark: main
				tag: tip
				parent: 0:cb9a9f314b8b
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: c

				changeset: 1:1e6c11564562
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: b

				$ hg up 1e6c11564562
				1 files updated, 0 files merged, 1 files removed, 0 files unresolved
				$ hg merge main
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)
				$ hg book
				main 2:d36c0562f908
				$ hg ci -m'merge'
				$ hg book
				main 2:d36c0562f908

				$ cd ..