tests/failfilemerge.py

revlog: move the splitting-inline-revlog logic inside the inner object

This is another large IO block that we need to move within the inner object if
we want's it to be self sufficient.

# extension to emulate interrupting filemerge._filemerge


from mercurial import (
    error,
    extensions,
    filemerge,
)


def failfilemerge(*args, **kwargs):
    raise error.Abort(b"^C")


def extsetup(ui):
    extensions.wrapfunction(filemerge, 'filemerge', failfilemerge)