phases: add a 'registernew' method to set new phases This new function will be used by code that adds new changesets. It ajusts the phase boundary to make sure added changesets are at least in their target phase (they end up in an higher phase if their parents are in a higher phase). Having a dedicated function also simplify the phases tracking. All the new nodes are passed as argument, so we know that all of them needs to have their new phase registered. We also know that no other nodes will be affected, so no extra computation are needed. This function differ from 'retractboundary' where some nodes might change phase while some other might not. It can also affect nodes not passed as parameters. These simplification also apply to the computation itself. For now we use '_retractboundary' there by convenience, but we may introduces simpler code later. While registering new revisions, we still need to check the actual phases of the added node because it might be higher than the target phase (eg: target is draft but parent is secret). We will migrate users over the next changesets.

phases: extract the core of boundary retraction in '_retractboundary' At the moment the 'retractboundary' function is called for multiple reasons: First, actually retracting boundaries. There are only two cases for theses: 'hg phase --force' and 'hg qimport'. This will need extra graph computation to retrieve the phase changes. Second, setting the phases of newly added changesets. In this case we already know all the affected nodes and we just needs to register different information (old phase is None). Third, when reducing the set of roots when advancing phase. The phase are already properly tracked so we do not needs anything else in this case. To deal with this difference in phase tracking, we extract the core logic into a private method that all three cases can use.

phases: track phase movements in 'advanceboundary' Makes advanceboundary record the phase movement of affected revisions in tr.changes['phases']. The tracking is not usable yet because the 'retractboundary' function can also affect phases. We'll improve that in the coming changesets.

phases: extract the intermediate set of affected revs When advancing phases, we compute the new roots for the phases above. During this process, we need to compute all the revisions that change phases (to the new target phases). Extract these revisions into a separate variable. This will be useful to record the phase changes in the transaction.

phase: put retractboundary out of the loop in advanceboundary It seems that we were calling retractboundary for each phases to process. Putting the retractboundary out of the loop reduce the number of calls, helping tracking the phases changes.

match: make unionmatcher a proper matcher unionmatcher is currently used where only a limited subset of its functions will be called. Specifically, visitdir() is never called. The next patch will pass it to dirstate.walk() where it will matter that visitdir() is correctly implemented, so let's fix that. Also add the explicitdir etc that will also be assumed by dirstate.walk() to exist on a matcher. Differential Revision: https://phab.mercurial-scm.org/D58

match: write forceincludematcher using unionmatcher The forceincludematcher is simply a unionmatcher of a includematcher (matching paths recursively) with the given matcher. Since the forceincludematcher is only used by sparse, move it there. I don't have a good sparse repo setup to test performance impact on. Differential Revision: https://phab.mercurial-scm.org/D57

histedit: extract InterventionRequired transaction handling to utils rebase will have similar logic, so let's extract it. Besides, it makes the histedit code more readable. We may want to parametrize acceptintervention() by the exception(s) that should result in transaction close. Differential Revision: https://phab.mercurial-scm.org/D66

histedit: create transaction outside of try Just a little refactoring to simplify the next patch. Differential Revision: https://phab.mercurial-scm.org/D65

histedit: remove transaction from state object The transaction is only used within a single function, so no need to store it on the state object. Differential Revision: https://phab.mercurial-scm.org/D64