dirstatemap: move `_drop_entry` out of the common methods
Only the Python implementation uses it.
Differential Revision: https://phab.mercurial-scm.org/D12514
# 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)