histedit: allow histedit --continue when not on a descendant (BC) Previously we would not allow --continue if the current working copy parent was not a descendant of the commit produced by the previous histedit step. There's nothing really blocking us from continuing the histedit in this situation, so let's stop aborting in this case. This is technically a BC change, but it is making things more forgiving so I think it's ok. In the future we will likely add an 'exec' action to histedit, which means the user can do whatever they want during the middle of a histedit (like perhaps calling 'hg update'), which means we'll need to support this case eventually anyway.

tags: explicitly log which tags cache file is being written We now have multiple tags cache files. Record exactly which file is being written. This should help aid debugging into performance issues with any single filter.

tags: write a separate tags cache file for unfiltered repos Since we changed the format of the tags cache, we should bump the filename. Before this patch, "tags" was being used for unfiltered repositories. Change the naming scheme to be consistent and ensure that a new cache file is used. While I was here, I updated the docs to describe the existence of multiple caches. I also added explicit test coverage for the creation of the unfiltered tags cache.

tags: return empty list of heads for no .hgtags case The caller only uses the heads to resolve tags from content of .hgtags. Returning a non-empty array is pointless if there is no .hgtags file.

tags: change format of tags cache files .hgtags fnodes are now written to a shared cache file. They don't need to exist in the per-filter tags cache files. Stop writing them. The format of the tags cache file has changed in a backwards incompatible way. This should be acceptable, as we just established per-filter tags cache files and no client should have per-filter tags cache files that will need to be read. So no backwards compatbility concern is present. The new format has a single header line followed by resolved tags entries. The header line is similar to the old first line with a major difference: we now compute and store a hash of the filtered revisions. Before, if the set of filtered revs changed, we may return incorrect results. We now detect that. A test for verifying filtered rev change is handled properly has been added.

tags: don't read .hgtags fnodes from tags cache files Now that we have a standalone and shared cache for .hgtags fnodes, the .hgtags fnodes stored in the tags cache files are redundant. Upcoming patches will change the format of the tags cache files to remove this data and to improve the validation. To prepare for this, we change the tags reading code to ignore all but the tip .hgtags fnodes entries in existing tags cache files. All fnodes lookups now go through our new shared cache, which is why test output changed. Format of tags cache files has not yet changed.

rebase: restore bookmark state on abort The bookmark state was already being preserved, but it wasn't being properly restored.

histedit: store backup file before histedit It's possible for the user to delete some of the commits they started with during a histedit, and aborting the histedit doesn't bring them back. Let's store a backup bundle so we can always recover the stack of commits from before they began.

histedit: replace pickle with custom serialization Pickle is undesirable, so let's serialize it ourselves. We keep the ability to parse existing pickle blobs for now.

devel-warn: add a prefix to all messages ("devel-warn: ") We want to make the origin and importance of the message clear to developers.