$ cat >> $HGRCPATH << EOF

  > [extensions]

  > rebase=

  > 

  > [experimental]

  > evolution = createmarkers

  > EOF

Create a repo with some tags

  $ hg init repo

  $ cd repo

  $ echo initial > foo

  $ hg -q commit -A -m initial

  $ hg tag -m 'test tag' test1

  $ echo first > first

  $ hg -q commit -A -m first

  $ hg tag -m 'test2 tag' test2

  $ hg -q up -r 0

  $ echo newhead > newhead

  $ hg commit -A -m newhead

  adding newhead

  created new head

Trigger tags cache population by doing something that accesses tags info

  $ hg log -G -T '{rev}:{node|short} {tags} {desc}\n'

  @  4:042eb6bfcc49 tip newhead

  |

  | o  3:c3cb30f2d2cd  test2 tag

  | |

  | o  2:d75775ffbc6b test2 first

  | |

  | o  1:5f97d42da03f  test tag

  |/

  o  0:55482a6fb4b1 test1 initial

  $ cat .hg/cache/tags

  4 042eb6bfcc4909bad84a1cbf6eb1ddf0ab587d41

  3 c3cb30f2d2cd0aae008cc91a07876e3c5131fd22 b3bce87817fe7ac9dca2834366c1d7534c095cf1

  55482a6fb4b1881fa8f746fd52cf6f096bb21c89 test1

  d75775ffbc6bca1794d300f5571272879bd280da test2

Create some hidden changesets via a rebase and trigger tags cache

repopulation

  $ hg -q rebase -s 1 -d 4

  $ hg log -G -T '{rev}:{node|short} {tags} {desc}\n'

  o  7:eb610439e10e tip test2 tag

  |

  o  6:7b4af00c3c83  first

  |

  o  5:43ac2a539b3c  test tag

  |

  @  4:042eb6bfcc49  newhead

  |

  o  0:55482a6fb4b1 test1 initial

.hgtags filenodes for hidden heads should be visible (issue4550)

(currently broken)

  $ cat .hg/cache/tags

  7 eb610439e10e0c6b296f97b59624c2e24fc59e30 b3bce87817fe7ac9dca2834366c1d7534c095cf1

  55482a6fb4b1881fa8f746fd52cf6f096bb21c89 test1

  d75775ffbc6bca1794d300f5571272879bd280da test2