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mq: disable qrecord during histedit (issue5981)

Authored by navaneeth.suresh.

Description

mq: disable qrecord during histedit (issue5981)

qrecord during histedit may lead to deadlock-like situations. qpop will throw
an error on called during histedit even after qrecord-ing those changes. This
patch makes qrecord to abort on histedit.

Differential Revision: https://phab.mercurial-scm.org/D5997

Details