[PATCH 3 of 3] summary: add evolution "troubles" information to parents header lines

[Yuya Nishihara]

On Mon, 10 Oct 2016 14:33:19 +0200, Denis Laxalde wrote:
> # HG changeset patch
> # User Denis Laxalde <denis.laxalde at logilab.fr>
> # Date 1475935828 -7200
> #      Sat Oct 08 16:10:28 2016 +0200
> # Node ID 1ec84349bfa3db4e753f9084837c7ea2f0c3a4b9
> # Parent  d9f7776c40b8c82bf438322f2442d99c4e116161
> # EXP-Topic evolve-ui
> summary: add evolution "troubles" information to parents header lines
> 
> Extend labels of the `parent: ` line according to what `hg log` displays when
> coming from changeset_printer. This would make this line appear the same in
> log and summary with custom colors in particular.
> 
> Extend that line with "troubles" information in parentheses, when the parent
> is troubled.
> 
> diff --git a/mercurial/commands.py b/mercurial/commands.py
> --- a/mercurial/commands.py
> +++ b/mercurial/commands.py
> @@ -6778,7 +6778,7 @@ def summary(ui, repo, **opts):
>          # shows a working directory parent *changeset*:
>          # i18n: column positioning for "hg summary"
>          ui.write(_('parent: %d:%s ') % (p.rev(), str(p)),
> -                 label='log.changeset changeset.%s' % p.phasestr())
> +                 label=cmdutil._changesetlabels(p))
>          ui.write(' '.join(p.tags()), label='log.tag')
>          if p.bookmarks():
>              marks.extend(p.bookmarks())
> @@ -6787,6 +6787,14 @@ def summary(ui, repo, **opts):
>                  ui.write(_(' (empty repository)'))
>              else:
>                  ui.write(_(' (no revision checked out)'))
> +        if p.troubled():
> +            ui.write(' (')
> +            ui.write(_('troubles: '),
> +                     label='log.changeset changeset.troubled')
> +            for trouble in p.troubles():
> +                ui.write(trouble,
> +                         label='trouble.%s' % trouble)
> +            ui.write(')')

Why do we need it in addition to the existing unstable/divergent/bumped
fields?