tests: add more test of resolution of content-divergent changesets This patch adds test of resolution of content-divergent changesets when relocation is required and it leads to conflicts. The test shows that we are not doing the right thing. This will be fixed in upcoming patches.

evolvestate: store info about relocation while resolving content-divergence While resolving content-divergence when they are on different parents, we relocate one of the node to parent of another one and this can lead to conflicts sometimes. So we need to store information about that state in evolvestate so that we can use that when user does `hg evolve --continue` or `--stop` or `--abort`. Now that we make sure, we store the new other node in evolvestate, we fix the behavior of handling the relocated commit and merge the right changesets.

evolve: factor out logic to merge content divergent csets in separate fn This will help us in reusing the logic if we need to while doing evolve --continue.

evolve: commit the transaction if conflicts occur while merging content-div Yes, let's commit the transaction in case conflicts occur. Yes, this is what unshelve does and this is one of the reasons we don't like unshelve. Previous patches added support for resolving content-divergence when they are on different parents with parent of one being the gca. In such cases, we relocate one of the divergent commit to the parent of another one. All the relocation stuff and merging divergent changeset stuff happens in a single transaction, so if there are conflicts while merging, we abort and the transaction rollsback and our relocated commit is not applied after abort. We don't want to process the relocation because that can lead to conflicts and we will have dirty wdir because of resolving conflicts. So, we commit the transaction when merging results in conflicts to make sure if relocation happened, we commit that. This fixes the absence of relocation commit found in previous patch and uncover a new bug about handling of relocated commit. Upcoming patch will fix it.

tests: add tests for resolving content-divergence when different parents This patch adds more tests for cases when we try to resolve content-divergence when they are on different parents. The last test shows the we are somehow missing the relocated commit in interrupted transaction. This will be fixed in next patch.

evolve: implement resolution of content-divergence when on differet parents This patch implements the basic version of resolution of content-divergence changesets when they are on different parents but one of the parent is gca of both the different parents. The functionality first relocates the divergent changeset which was left behind and then resolves the content-divergence like it resolves in normal cases. This is a very basic implementation because it still does not work on interrupted evolution. Test changes in this patch shows the basic functionality working. The output of dry-run is also required to be tweaked in such cased. Upcoming patches will add more tests and will improve the implementation to work during conflicts too.

tests: add tests for resolving content-divergence with parent change This patch adds a new test file test-evolve-content-divergence.t which tests the resolution of content divergence when the divergent changesets does not have the same parents.

CHANGELOG: add an entry about fixing issue5877

evolve: pop up editor if conflicts occur while merging commit messages Last patch added support for merging commit messages while resolving content divergence. In case of conflicts we fallback to one of the divergent commit messages. After this patch, we will pop up an editor where user has to resolve the conflicts in the commit messages and then continue. Tests are added for this. We need to fix handling in test-sharing.t to use HGEDITOR to fix conflicts and pass the new commit message. Future improvement can be that we should respect HGMERGE while merging commit descriptions too.

evolve: merge commit messages while resolving content-divergence (issue5877) While resolving content-divergence, there can be divergence in commit messages too which should be resolved. This patch uses the hg's internal merge API's to merge commit messages of divergent changesets with predecessor as the base. In case of conflicts, we fallback to divergent's commit message which should be changed in future. We should pop up the editor with the commit message and the conflict markers and let user fix that. Tests are added for the functionality added.