bookmarks: pull --update updates to active bookmark if it moved (issue4007)
This makes `hg pull --update` behave the same wrt the active bookmark as
`hg pull && hg update` does as of 2096e025a728. A helper function,
bookmarks.calculateupdate, is added to prevent code duplication between
postincoming and update.
http://mercurial.selenic.com/bts/issue842
$ hg init
$ echo foo > a
$ hg ci -Ama
adding a
$ hg up -r0000
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo bar > a
Should issue new head warning:
$ hg ci -Amb
adding a
created new head
$ hg up -r0000
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo stuffy > a
Should not issue new head warning:
$ hg ci -q -Amc
$ hg up -r0000
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo crap > a
$ hg branch testing
marked working directory as branch testing
(branches are permanent and global, did you want a bookmark?)
Should not issue warning:
$ hg ci -q -Amd