branchmap: avoid ancestor computations in absence of non-continous branches The branchhead computation is one of the more heavy operations for bigger repositories as it has to scan all changesets and potentially involves the expensive computation of the ancestor sets. Redo the computation to handle the common cases directly and use tighter conditions for when the ancestor scan is necessary. Most importantly, avoid it completely if the non-continous branches are processed in one update as seen in the initial computation after a clone. For the Mercurial repository, it gives a small 2-3% performance boost. For the NetBSD test repository, it cuts the time in half. Differential Revision: https://phab.mercurial-scm.org/D9631

persistent-nodemap: also list related file as part of the store This make sure they are will be selected during upgrade, and copy based clone. Differential Revision: https://phab.mercurial-scm.org/D9749

upgrade: explicitly test for revlog index We do not want to exclude `.d` we want to only include `.i`. We are about to add more extension type (for the persistent nodemap: `.n`, `.nd`) so lets make the list explicit instead. Differential Revision: https://phab.mercurial-scm.org/D9748

persistent-nodemap: highlight that node is not sent when streaming We have a local work-around, however having that data sent in the first place would be better. So we start with a test that monitor what is sent, and notice they are not. Differential Revision: https://phab.mercurial-scm.org/D9736

persistent-nodemap: test it (does not) exist after a stream clone This is currently buggy. We add a test before fixing the bug. Differential Revision: https://phab.mercurial-scm.org/D9734

persistent-nodemap: test it (does not) exist after a local clone This is currently buggy. We add a test before fixing the bug. Differential Revision: https://phab.mercurial-scm.org/D9733

persistent-nodemap: test that is it present after a clone The persistent nodemap is actually missing after local and stream clone. We start by adding a test for the case that works so that we can compare output after the fix. Differential Revision: https://phab.mercurial-scm.org/D9732

narrow: overwrite readfast in excludeddirmanifestctx The excludeddirmanifestctx does not have underlying storage (because it is excluded) so the implementation of the `readfast` trying to access it crash. This was reveled while running some cache warning code on narrow repositories. That code will be introduced further down in the series. Differential Revision: https://phab.mercurial-scm.org/D9731

patch: handle filenames with trailing spaces I have no idea if this is *actually* supported by the patch file format, but at least when reading from a patch file created by running `hg shelve`, it is written out such that there's a trailing space after the second (`b`) filename. When we read the patch file, we remove the space before parsing the filenames, so it doesn't end up matching the other sources of what files are in the shelve. We observed this internally due to a wrapper around unshelve that called into patch.changedfiles, but `hg patch` is able to reproduce the issue as well, so I've included both tests. Differential Revision: https://phab.mercurial-scm.org/D9729

rust: fix testing with $TMPDIR ≠ /tmp Differential Revision: https://phab.mercurial-scm.org/D9670