revlog: remove micro-optimization for looking up only nullid index_find_node() would call nt_find() before initializing the node tree. nt_find() would then return -2 unless the requested revision was the null revision. I can't imagine what scenario that is optimizing for, and doing the initialization earlier makes the code simpler and easier to follow, so that's what this patch does. Differential Revision: https://phab.mercurial-scm.org/D4027

revlog: remove unnecessary output parameter from node_check() The "nodelen" output parameter is always set to 20 if the function returns successfully. Differential Revision: https://phab.mercurial-scm.org/D4026

narrow: move status-filtering to core and to ctx One of my recent changes from repo.status(ctx1, ctx2) to ctx1.status(ctx2) broke some of our Google-internal tests. The problem turned out to be that the narrow extension was overriding repo.status() to make it filter out paths outside the narrowspec. When I changed to ctx1.status(ctx2), then that filtering obviously got lost. ctx.status() seems like a better method to do the filtering in, so this patch moves the filtering into that method, thereby also moving it out of the extension and into core. Differential Revision: https://phab.mercurial-scm.org/D4068

amend: support "history-editing-backup" config option Now, amend is in the list of those history editing commands which support `history-editing-backup` config option. If you don't want to store any backup then just use this config. [ui] hisotry-editing-backup = False Current status of list of history editing commands which support this config: 1. histedit 2. rebase 3. amend Differential Revision: https://phab.mercurial-scm.org/D3968

rebase: move "backup" flag to rebaseruntime It was getting messy to populate "backup" flag to calls of `_finishrebase()` and `_prepareabortorcontinue`, so made some changes to move "backup" flag to rbsrt. Differential Revision: https://phab.mercurial-scm.org/D4055

i18n: format warning of hggettext in standard compiler error style Now, hggettext specific warning messages are formatted in: FILENAME:LINENO:MESSAGE This allows editors to jump into corresponded line easily.

i18n: omit redundant translatable synopsis text to avoid xgettext warning This empty translatable synopsis text causes xgettext warning below: Empty msgid. It is reserved by GNU gettext: gettext("") returns the header entry with meta information, not the empty string. This "synopsis" argument of @command annotation is omitable.

i18n: avoid substitution of PYFILES at runtime for readability of output This substitution decreases readability of "make update-pot" output, because PYFILES consists of many files. This patch makes "make update-pot" show "find mercurial hgext doc -name '*.py'" instead of many *.py files at runtime.

util: make new timedcmstats class Python 3 compatible

fix: add a monkey-patchable point after all new revisions have been committed Differential Revision: https://phab.mercurial-scm.org/D4048