contributor: change mentions of mpm to olivia Matt Mackall is now Olivia Mackall. I reached out to her about changing the copyright notices to reflect this change and she gave me the green light, so I changed everything relevant. Differential Revision: https://phab.mercurial-scm.org/D10266

fuzz: use Python 3 in makefile As in the previous patch, I copied the snippet defining `PYTHON` from the root Makefile. Differential Revision: https://phab.mercurial-scm.org/D10252

makefile: use Python 3 by default when building docs as well I copied the snippet defining `PYTHON` from the root Makefile. Differential Revision: https://phab.mercurial-scm.org/D10251

tests: replace some `python` by `"$PYTHON"` to not only use Python 2 I deleted my `python` binary as a test and a few tests started failing. Differential Revision: https://phab.mercurial-scm.org/D10250

copies: distinguish between merged and touched files during upgrade This a filenode being different between p1, p2 and result does not necessarily means a merges happens. For example p2 could be a strict newer version of p1, so the p2 version is picked by the manifest merging, but then the file is manually updated before the commit. In this case the file should be detected as touched. Differential Revision: https://phab.mercurial-scm.org/D10220

copies: detect files as `touched/salvaged` if they only existed on one side The file cannot be merged if there was content to merge on the other side. So the previous record was wrong. In the general case, the file existed only on one side and got touched during the merge. So it should detected as touched. They are a special case where the merge manually prevent the file to be deleted. In this case the file is marked as `salvaged`. The result of this `salvaged` recording, copy-tracing-wise, is the same as recording it as `merged`. This is probably why they were recorded as `merged` in the first place. Differential Revision: https://phab.mercurial-scm.org/D10219

test-copies: add a test updating file content while salvaging it A deleted file is brought back during a merge. Its content is changed in the same go. This reveal some issue with the upgrade code. Differential Revision: https://phab.mercurial-scm.org/D10088

test-copies: show some wrong ChangedFiles upgrade For file present only on one side and touched during merge, the upgrade code confused them as "merged". However they should be either "touched", or "salvaged" but they are currently recorded as "merged". See the next changesets for more details on these cases and fix. Differential Revision: https://phab.mercurial-scm.org/D10218

commit: get info from mergestate whether a file was merged or not While commiting a merge, the commit code does not know whether a file was merged during `hg merge` or not. This leads the commit code to look for filelog ancestor to choose parents of new filelog created on merge commit. This leads to wrong results in some cases as demonstrated by previous patch. From this patch, we start storing information about merged files in mergestate in stateextras and then use that on commit to detect whether we need to set two parents or not. Differential Revision: https://phab.mercurial-scm.org/D10149

typing: disable processing of mercurial/upgrade_utils/actions.py There was a recent regression in pytype that causes processing to stall and consume memory, and it doesn't sound like it will be fixed any time soon. Differential Revision: https://phab.mercurial-scm.org/D10273