tests: demonstrate crash when committing subset of copies to changeset When writing copy metadata to the changeset and not committing all copies in the dirstate, we get a ProgrammingError. This commit adds two tests showing how to trigger this bug. Differential Revision: https://phab.mercurial-scm.org/D6749

bdiff-torture: fix pyflakes warning reporting undefined name 'inst' Looks like I got a latest version of pyflakes somehow or it's running on py3 and it spotted this. Differential Revision: https://phab.mercurial-scm.org/D6757