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revert: distinguish between "check" and "backup" strategy...
revert: distinguish between "check" and "backup" strategy "check" behaves as backup did before. We check if the current file differs from destination and we create a backup if it does. This is used for untracked files that will be overwritten by formerly-deleted files. We have to do the manual check since no status output can provide the content comparison. "backup" is now doing unconditional backup. This can be used for files seen as modified compared to both the target and the working directory. In such a case, we know that the file differs from target without actually comparing any content. This new "backup" strategy will be especially useful in the case of files added between the target and the working directory -parent- with additional modifications in the working directory -itself-. In that case we know we need to back it up, but we cannot run the content check as the files does not exists in target.

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extensions.txt
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Mercurial has the ability to add new features through the use of
extensions. Extensions may add new commands, add options to
existing commands, change the default behavior of commands, or
implement hooks.
To enable the "foo" extension, either shipped with Mercurial or in the
Python search path, create an entry for it in your configuration file,
like this::
[extensions]
foo =
You may also specify the full path to an extension::
[extensions]
myfeature = ~/.hgext/myfeature.py
See :hg:`help config` for more information on configuration files.
Extensions are not loaded by default for a variety of reasons:
they can increase startup overhead; they may be meant for advanced
usage only; they may provide potentially dangerous abilities (such
as letting you destroy or modify history); they might not be ready
for prime time; or they may alter some usual behaviors of stock
Mercurial. It is thus up to the user to activate extensions as
needed.
To explicitly disable an extension enabled in a configuration file of
broader scope, prepend its path with !::
[extensions]
# disabling extension bar residing in /path/to/extension/bar.py
bar = !/path/to/extension/bar.py
# ditto, but no path was supplied for extension baz
baz = !