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match: introduce badmatch() to eliminate long callback chains with subrepos...
match: introduce badmatch() to eliminate long callback chains with subrepos Various bit of code replace the bad method on matchers, and then delegate to the original bad method after doing some custom processing. At least some of these forget to restore the original method when the need has passed, and then when the matcher is passed to the next subrepo (even a sibling), another layer is added such that the chain looks like: bad2 -> bad1 -> original At best, this is a waste of processing, but sometimes spurious messages can be emitted (e.g. ccb1623266eb). The trick with this copy of the matcher is to make sure it is *not* passed to any subrepo- the original must be passed instead.
Mads Kiilerich - - Load All Authors

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revisions.txt
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Mercurial supports several ways to specify individual revisions.
A plain integer is treated as a revision number. Negative integers are
treated as sequential offsets from the tip, with -1 denoting the tip,
-2 denoting the revision prior to the tip, and so forth.
A 40-digit hexadecimal string is treated as a unique revision
identifier.
A hexadecimal string less than 40 characters long is treated as a
unique revision identifier and is referred to as a short-form
identifier. A short-form identifier is only valid if it is the prefix
of exactly one full-length identifier.
Any other string is treated as a bookmark, tag, or branch name. A
bookmark is a movable pointer to a revision. A tag is a permanent name
associated with a revision. A branch name denotes the tipmost open branch head
of that branch - or if they are all closed, the tipmost closed head of the
branch. Bookmark, tag, and branch names must not contain the ":" character.
The reserved name "tip" always identifies the most recent revision.
The reserved name "null" indicates the null revision. This is the
revision of an empty repository, and the parent of revision 0.
The reserved name "." indicates the working directory parent. If no
working directory is checked out, it is equivalent to null. If an
uncommitted merge is in progress, "." is the revision of the first
parent.