mercurial/templates/map-cmdline.status

branchmap: add a cache validation cache, avoid expensive re-hash on every use

In a pathological `hg log` case, we end up executing the branchmap validity
checking twice per commit displayed. Or maybe we always do, and I just noticed
because it's really slow in this repo for some reason.

Before:
```
  Time (mean ± σ):      9.816 s ±  0.071 s    [User: 9.435 s, System: 0.392 s]

  Range (min … max):    9.709 s …  9.920 s
```

After:
```
  Time (mean ± σ):      8.671 s ±  0.078 s    [User: 8.309 s, System: 0.392 s]

  Range (min … max):    8.594 s …  8.816 s
```

Differential Revision: https://phab.mercurial-scm.org/D9023

%include map-cmdline.default

[templates]
# Override base templates
changeset = '{cset}{branches}{bookmarks}{tags}{parents}{luser}{ldate}{summary}{lfiles}\n'
changeset_verbose = '{cset}{branches}{bookmarks}{tags}{parents}{luser}{ldate}{description}{lfiles}\n'
changeset_debug = '{fullcset}{branches}{bookmarks}{tags}{lphase}{parents}{manifest}{luser}{ldate}{extras}{description}{lfiles}\n'

# Override the file templates
lfiles = '{if(files,
              label('ui.note log.files',
                    'files:\n'))}{lfile_mods}{lfile_adds}{lfile_dels}'

lfile_adds = '{file_adds % "{lfile_add}{lfile_src}"}'
lfile_mods = '{file_mods % "{lfile_mod}{lfile_src}"}'
lfile_add = '{label("status.added", "A {file}\n")}'
lfile_mod = '{label("status.modified", "M {file}\n")}'
lfile_src = '{ifcontains(file, file_copies_switch,
              label("status.copied", "  {get(file_copies_switch, file)}\n"))}'

lfile_dels = '{file_dels % "{label('status.removed', 'R {file}\n')}"}'