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branchmap: handle nullrev in setcachedata...
branchmap: handle nullrev in setcachedata 906be86990 recently changed to switch from: self._rbcrevs[rbcrevidx:rbcrevidx + _rbcrecsize] = rec to pack_into(_rbcrecfmt, self._rbcrevs, rbcrevidx, node, branchidx) This causes an exception if rbcrevidx is -1 (i.e. the nullrev). The old code handled this because python handles out of bound sets to arrays gracefully. The new code throws because the self._rbcrevs buffer isn't long enough to write 8 bytes to. Normally it would've been resized by the immediately preceding line, but because the 0 length buffer is greater than the idx (-1) times the size, no resize happens. Setting the branch for the nullrev doesn't make sense anyway, so let's skip it. This was caught by external tests in the Facebook extensions repo, but I've added a test here that catches the issue.
Augie Fackler - - Load All Authors

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pager.txt
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Some Mercurial commands 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, the pager extensions uses the environment variable
$PAGER. If neither pager.pager, nor $PAGER is set, a default pager
will be used, typically `more`.
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::
[pager]
enable = false
which will prevent the pager from running.