$ cat >> $HGRCPATH << EOF

  > [extensions]

  > blackbox=

  > rebase=

  > mock=$TESTDIR/mockblackbox.py

  > 

  > [experimental]

  > evolution.createmarkers=True

  > 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

  $ hg tag -m 'test head 2 tag' head2

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

  @  5:2942a772f72a tip test head 2 tag

  |

  o  4:042eb6bfcc49 head2 newhead

  |

  | o  3:c3cb30f2d2cd  test2 tag

  | |

  | o  2:d75775ffbc6b test2 first

  | |

  | o  1:5f97d42da03f  test tag

  |/

  o  0:55482a6fb4b1 test1 initial

Trigger tags cache population by doing something that accesses tags info

  $ hg tags

  tip                                5:2942a772f72a

  head2                              4:042eb6bfcc49

  test2                              2:d75775ffbc6b

  test1                              0:55482a6fb4b1

  $ cat .hg/cache/tags2-visible

  5 2942a772f72a444bef4bef13874d515f50fa27b6

  042eb6bfcc4909bad84a1cbf6eb1ddf0ab587d41 head2

  55482a6fb4b1881fa8f746fd52cf6f096bb21c89 test1

  d75775ffbc6bca1794d300f5571272879bd280da test2

Hiding a non-tip changeset should change filtered hash and cause tags recompute

  $ hg debugobsolete -d '0 0' c3cb30f2d2cd0aae008cc91a07876e3c5131fd22 -u dummyuser

  obsoleted 1 changesets

  $ hg tags

  tip                                5:2942a772f72a

  head2                              4:042eb6bfcc49

  test1                              0:55482a6fb4b1

  $ cat .hg/cache/tags2-visible

  5 2942a772f72a444bef4bef13874d515f50fa27b6 f34fbc9a9769ba9eff5aff3d008a6b49f85c08b1

  042eb6bfcc4909bad84a1cbf6eb1ddf0ab587d41 head2

  55482a6fb4b1881fa8f746fd52cf6f096bb21c89 test1

  $ hg blackbox -l 5

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> tags

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> 2/2 cache hits/lookups in * seconds (glob)

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> writing .hg/cache/tags2-visible with 2 tags

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> tags exited 0 after * seconds (glob)

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> blackbox -l 5

Hiding another changeset should cause the filtered hash to change

  $ hg debugobsolete -d '0 0' d75775ffbc6bca1794d300f5571272879bd280da -u dummyuser

  obsoleted 1 changesets

  $ hg debugobsolete -d '0 0' 5f97d42da03fd56f3b228b03dfe48af5c0adf75b -u dummyuser

  obsoleted 1 changesets

  $ hg tags

  tip                                5:2942a772f72a

  head2                              4:042eb6bfcc49

  $ cat .hg/cache/tags2-visible

  5 2942a772f72a444bef4bef13874d515f50fa27b6 2fce1eec33263d08a4d04293960fc73a555230e4

  042eb6bfcc4909bad84a1cbf6eb1ddf0ab587d41 head2

  $ hg blackbox -l 5

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> tags

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> 1/1 cache hits/lookups in * seconds (glob)

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> writing .hg/cache/tags2-visible with 1 tags

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> tags exited 0 after * seconds (glob)

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> blackbox -l 5

Resolving tags on an unfiltered repo writes a separate tags cache

  $ hg --hidden tags

  tip                                5:2942a772f72a

  head2                              4:042eb6bfcc49

  test2                              2:d75775ffbc6b

  test1                              0:55482a6fb4b1

  $ cat .hg/cache/tags2

  5 2942a772f72a444bef4bef13874d515f50fa27b6

  042eb6bfcc4909bad84a1cbf6eb1ddf0ab587d41 head2

  55482a6fb4b1881fa8f746fd52cf6f096bb21c89 test1

  d75775ffbc6bca1794d300f5571272879bd280da test2

  $ hg blackbox -l 5

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> --hidden tags

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> 2/2 cache hits/lookups in * seconds (glob)

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> writing .hg/cache/tags2 with 3 tags

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> --hidden tags exited 0 after * seconds (glob)

  1970/01/01 00:00:00 bob @2942a772f72a444bef4bef13874d515f50fa27b6 (5000)> blackbox -l 5