transaction: add a `hasfinalize` method The method allow code to check if an existing callback exists. It allow them to skip potentially expensive setup for a callback. Differential Revision: https://phab.mercurial-scm.org/D7832

changelog: fix the diverted opener to accept more kwargs The current code prevent the use of `atomictemp` file with the changelog opener. I do not see a good reason for this limitation. Differential Revision: https://phab.mercurial-scm.org/D7831

revlog: reorder a conditionnal about revlogio if we are using REVLOGV0, we will not use a rust based index. This small line movement make it clearer. Differential Revision: https://phab.mercurial-scm.org/D7830

rebase: delete seemingly unnecessary needupdate() This seemed to be about checking that the user hasn't updated away when we asked them to resolve merge conflicts. These days we call `cmdutil.checkunfinished()` and refuse to update, so the user shouldn't be able to get into this state. `test-rebase-interruptions.t` actually has some tests where it disables the rebase extension in order to be allowed to do some of these updates. That still passes, but I wouldn't personally haved cared if that failed. Differential Revision: https://phab.mercurial-scm.org/D7825

workingctx: move setparents() logic from localrepo to mirror overlayworkingctx It would be nice to later be able to call `wctx.setparents()` whether `wctx` is a `workingctx` or an `overlayworkingctx`. Differential Revision: https://phab.mercurial-scm.org/D7823

overlayworkginctx: implement a setparents() to mirror dirstate.setparents() This lets us make the in-memory and on-disk code a bit more similar. I'll soon also implement setparents() on the regular workingctx. Differential Revision: https://phab.mercurial-scm.org/D7822

overlayworkingctx: default branch to base context's branch This matches what the dirstate does (it reuses working copy parent's branch unless told otherwise). By moving the default out of `rebase.commitmemorynode()`, it will let us clean that up better later. Differential Revision: https://phab.mercurial-scm.org/D7821

grep: speed up `hg grep --all-files some/path` by using ctx.matches(match) ctx.matches(match) avoids walking unintersting parts of the tree when using tree manifests. That can make a very big difference when grepping in a small subset of the tree (2.0s -> 0.7s in my case, but can of course be made more extreme by picking a smaller subset of files). Differential Revision: https://phab.mercurial-scm.org/D7820

fix: fix grammar/typos in hg help -e fix

py3: byteify the opener option to use `rust.index` to allow Rust revlogs It looks like this corresponds to the byteified key written in localrepo in 8042856c90b6. Differential Revision: https://phab.mercurial-scm.org/D7818