changelog: move branchinfo to changelogrevision The function parses the extra dictionary after looking up the changelogrevision. To avoid duplicated look up, it is better to provide it as property of changelogrevision instead. Keep the function for a release cycle as at least the topic extension depends on it. Differential Revision: https://phab.mercurial-scm.org/D9779

rust: lower compile error on non-linux platforms to a warning As discussed on D9671#146704 this lowers the error to a warning. Differential Revision: https://phab.mercurial-scm.org/D9852

purge: move extension into core mercurial The motivation is simple: it's nicer to avoid gating basic functionality. To reduce the risk of people shooting themselves in the feet, `--confirm` is now the default, unless the extensions is loaded.. For review of the body of the purge command, use this instead of what hg/phabricator will show (the block of code is modified, not just moved): Differential Revision: https://phab.mercurial-scm.org/D9820

purge: also deal with directory with --confirm Getting the exact number is simple (you have to project the result of previous deletion to detect super-directory with only about-to-be-deleted content). So we use a vaguer message. Differential Revision: https://phab.mercurial-scm.org/D9819

purge: add a --confirm option The options provide a prompt to the user before permanent deletion are made. The prompt is currently not aware of directory deletion. I'll fix this in the next changesets. Differential Revision: https://phab.mercurial-scm.org/D9818

filemerge: add a hacktastic version of internal:merge3 for merge diffs This is a version of merge3 that always reports success, so that conflict markers get preserved without us having to implement conflict storage for in-memory merge. Credit to martinvonz for the idea. The only planned consumer of this "merge tool" is my upcoming merge-diffs functionality, though I suspect it could be useful in other ways. Differential Revision: https://phab.mercurial-scm.org/D8515

packaging: include `windows_curses` when building py2exe The `_curses.pyd` module was previously being included by py2exe's module search, but it left out `_curses_panel.pyd`. Differential Revision: https://phab.mercurial-scm.org/D9857