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strip: make --keep option not set all dirstate times to 0...
strip: make --keep option not set all dirstate times to 0 hg strip -k was using dirstate.rebuild() which reset all the dirstate entries timestamps to 0. This meant that the next time hg status was run every file was considered to be 'unsure', which caused it to do expensive read operations on every filelog. On a repo with >150,000 files it took 70 seconds when everything was in memory. From a cold cache it took several minutes. The fix is to only reset files that have changed between the working context and the destination context. For reference, --keep means the working directory is left alone during the strip. We have users wanting to use this operation to store their work-in-progress as a commit on a branch while they go work on another branch, then come back later and be able to uncommit that work and continue working. They currently use 'git reset HARD^' to accomplish this in git.

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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 revision
of that 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.