unshelve: unify logic around creating an unshelve changeset This is a follow-up patch to 5162753c4c14 on addressing reviews on the commit. This unifies the logic around creating an unshelve changeset. Differential Revision: https://phab.mercurial-scm.org/D6683

fix: ignore fixer tool configurations that are missing patterns This is to prevent a crash under the same circumstances. This is also to avoid data loss due to accidental application of a fixer tool to all files, if the matching logic somehow changed to that effect. Affecting all files until otherwise configured would be dangerous, and not very useful. We shouldn't abort because there may be other fixers, and it may still be useful to run them without having to adjust configuration. A user might not feel confident in changing configs, for example. Differential Revision: https://phab.mercurial-scm.org/D6693

fix: add a test case around the effect of cwd on pattern matching This was not covered by previous tests. It is related to a regression encountered at Google due to misconfiguration of [fix]. Differential Revision: https://phab.mercurial-scm.org/D6692

fix: remove support for :fileset sub-config in favor of :pattern Differential Revision: https://phab.mercurial-scm.org/D6691

fsmonitor: add support for extra `hg debuginstall` data This might make some things easier to debug, and for default bug report templates it'll help collect more data from users all at once. I don't actually need fsmonitor in our bug reports (we don't use it), but this demonstrates the utility of the preceding patches without having to add new things to core. Differential Revision: https://phab.mercurial-scm.org/D6682

debugcommands: add support for extensions adding their own debug info We've had a couple of cases where it'd be handy at Google to add data to `hg debuginstall`'s output. We've kludged around that at various times, but it seems reasonable to let extensions add their own data here so extension maintainers can get useful extra data. Differential Revision: https://phab.mercurial-scm.org/D6681

fsmonitor: refactor watchmanclient.client to accept ui and repo path This will make my next patch simpler. Differential Revision: https://phab.mercurial-scm.org/D6680

contrib: install Python 3.8b2 instead of 3.8a2 Let's install the most recent Python 3.8 distribution. Differential Revision: https://phab.mercurial-scm.org/D6674