match: teach diffmatcher.visitdir() to return 'all' if possible
This patch teaches differencematcher.visitdir() to return 'all' when
m1.visitdir() returns 'all' and m2 does not matches.
Before this patch, from a differencematcher.visitdir(), we always returned
either True or False. We never returned 'all' even when we can. This causes
problem when m1 and m2 of a differencematcher are themselves differencematcher.
In that case, we try to check:
`if self._m2_.visitdir(dir) == 'all'`
which will never be 'all' even though it can be.
This leads to iterating over a lot of sub-directory manifest, even though we
don't want to while extending a narrow clone. I am yet to measure the impact of
this but calculating manifest was taking ~50-60 seconds, so this should
definitely save some of time there.
Differential Revision: https://phab.mercurial-scm.org/D5814
<?xml version="1.0" encoding="utf-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
<?include guids.wxi ?>
<?include defines.wxi ?>
<?define hg_po_langs =
da;de;el;fr;it;ja;pt_BR;ro;ru;sv;zh_CN;zh_TW
?>
<Fragment>
<DirectoryRef Id="INSTALLDIR">
<Directory Id="i18ndir" Name="i18n" FileSource="$(var.SourceDir)">
<Component Id="i18nFolder" Guid="$(var.i18nFolder.guid)" Win64='$(var.IsX64)'>
<File Name="hggettext" KeyPath="yes" />
<?foreach LANG in $(var.hg_po_langs) ?>
<File Id="hg.$(var.LANG).po"
Name="$(var.LANG).po"
/>
<?endforeach?>
</Component>
</Directory>
</DirectoryRef>
</Fragment>
</Wix>