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filecache: unimplement __set__() and __delete__() (API)...
filecache: unimplement __set__() and __delete__() (API) Implementing __set__() implies that the descriptor can't be overridden by obj.__dict__, which means any property access involves slow function call. "Data descriptors with __set__() and __get__() defined always override a redefinition in an instance dictionary. In contrast, non-data descriptors can be overridden by instances." https://docs.python.org/2.7/reference/datamodel.html#invoking-descriptors This patch basically backs out 236bb604dc39, "scmutil: update cached copy when filecached attribute is assigned (issue3263)." The problem described in issue3263 (which is #3264 in Bugzilla) should no longer happen since repo._bookmarkcurrent has been moved to repo._bookmarks.active. We still have a risk of introducing similar bugs, but I think that's the cost we have to pay. $ hg perfrevset 'branch(tip)' -R mercurial (orig) wall 0.139511 comb 0.140000 user 0.140000 sys 0.000000 (best of 66) (prev) wall 0.114195 comb 0.110000 user 0.110000 sys 0.000000 (best of 81) (this) wall 0.099038 comb 0.110000 user 0.100000 sys 0.010000 (best of 93)
Xavier Lepaul - - Load All Authors

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pager.txt
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Some Mercurial commands can produce a lot of output, and Mercurial will
attempt to use a pager to make those commands more pleasant.
To set the pager that should be used, set the application variable::
[pager]
pager = less -FRX
If no pager is set in the user or repository configuration, Mercurial uses the
environment variable $PAGER. If $PAGER is not set, pager.pager from the default
or system configuration is used. If none of these are set, a default pager will
be used, typically `less` on Unix and `more` on Windows.
.. container:: windows
On Windows, `more` is not color aware, so using it effectively disables color.
MSYS and Cygwin shells provide `less` as a pager, which can be configured to
support ANSI color codes. See :hg:`help config.color.pagermode` to configure
the color mode when invoking a pager.
You can disable the pager for certain commands by adding them to the
pager.ignore list::
[pager]
ignore = version, help, update
To ignore global commands like :hg:`version` or :hg:`help`, you have
to specify them in your user configuration file.
To control whether the pager is used at all for an individual command,
you can use --pager=<value>:
- use as needed: `auto`.
- require the pager: `yes` or `on`.
- suppress the pager: `no` or `off` (any unrecognized value
will also work).
To globally turn off all attempts to use a pager, set::
[ui]
paginate = never
which will prevent the pager from running.