changing-files: add clean computation of changed files for roots The `files` field is not reliable, so we need to compute things from scratch. We start with the simplest case root changesets. In the beginning they was nothing, then user said "let there be files" and there were added files. Differential Revision: https://phab.mercurial-scm.org/D9126

changing-files: add a debug command display changed files The binary output from sidedata is useful to verify the underlying data do not get corrupted. However having a human readable version is much simpler for debuging the changed files data itself. So we add a debug command to dump this information and we use it in the tests. Differential Revision: https://phab.mercurial-scm.org/D9125

side-data: add a test to check sidedata upgrade We want to make sure that sidedata computed at commit time and during upgrade are the same. To do so, we upgrade the repository in `test-copies-chain-merge.t` since the file is checking all the special case that we need to catch. The sidedata content in both case should be the same. Differential Revision: https://phab.mercurial-scm.org/D9124

changing-files: split the changing files computation from encoding The side data encoding is already in its own function, now we move the changing files computation in it own function, it will receive more updates in the coming changesets. Differential Revision: https://phab.mercurial-scm.org/D9123

salvaged: record salvaged in ChangingFiles at commit time The new code is a simple but effective way to detect this information. We might be able to move it inside the various conditionnal above, but I want to focus on simplicity until we have a full working stack. It is worth noting that if we record the information in the ChangingFiles object, it is not persisted yet. This will comes with later changesets. Differential Revision: https://phab.mercurial-scm.org/D9120

salvaged: track removal-candidates in more cases If we want to use this information for copy tracing, then we need to be able to record it. First we unlock the recording of deletion candidates, and we will actually record the data in the next changeset. Differential Revision: https://phab.mercurial-scm.org/D9119

salvaged: explicitly skip salvaged file while encoding This is a temporary measure to avoid diverging test cases (between commit time sidedata and upgraded sidedata) while we implement salvaged tracking in the different cases. This will be dropped soon. Differential Revision: https://phab.mercurial-scm.org/D9122

changing-files: add a "salvaged" set to track file that were not removed We need this set for the copy tracing algorithm. See documentation for details about this set. Differential Revision: https://phab.mercurial-scm.org/D9118

tests: back out accidentally queued changeset 0627cd03b1e9 I accidentally queued other people's patches on top of my own and pushed mine along with theirs.

tests: fix test-check-module-imports.t broken by D9150 Differential Revision: https://phab.mercurial-scm.org/D9177