tests/failfilemerge.py

releasenotes: use the right API to access the 'sections'

Preventing direct access to the underlying dict fix a breakage introduced by the
refactoring in d3df397e7a59.

This changeset is similar to 271dfcb98544, 5272542196cc and f7621fa14b84. The
breackage of `releasenotes.py` stayed under my radar as the CI did not have
fuzzywuzzy installed. (Something that is about to be fixed).

Differential Revision: https://phab.mercurial-scm.org/D10121

# extension to emulate interrupting filemerge._filemerge

from __future__ import absolute_import

from mercurial import (
    error,
    extensions,
    filemerge,
)


def failfilemerge(
    filemergefn, premerge, repo, wctx, mynode, orig, fcd, fco, fca, labels=None
):
    raise error.Abort(b"^C")
    return filemergefn(premerge, repo, mynode, orig, fcd, fco, fca, labels)


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