sparse: consolidate common code for writing sparse config In 3 functions we were writing the sparse config and updating the working directory. In two of them we had a transaction-like process for restoring the sparse config in case of wdir update fail. Because the pattern is common, we've already made mistakes, and the complexity will increase in the near future, let's consolidate the code into a reusable function. As part of this refactor, we end up reading the "sparse" file twice when updating it. This is a bit sub-optimal. But I don't think it is worth the code complexity to pass around the variables to avoid the redundancy. Differential Revision: https://phab.mercurial-scm.org/D109

revset: pass repo when passing ui The repo instance is currently only used to provide a changeset lookup function as part of parsing revsets. I /think/ this allows node fragments to resolve. I'm not sure why we wouldn't want this to always "just work" if parsing a revset string. Plus, an upcoming commit will introduce a new consumer that needs a handle on the repo. So passing it more often will make that code work more. Passing a repo instance in all callers of revset.match* results in a bunch of test changes. Notably, branch and tags caches get populated as part of evaluating revsets. I'm not sure if this is desirable. So this patch takes the conservative approach and only passes the repo if we're passing a ui instance. Differential Revision: https://phab.mercurial-scm.org/D97

win32: copy-edit debugssl messages to match prevailing style