filemerge: introduce class whose objects represent files not in a context Most code is going to barf at the return values here (particularly from data and size), so we restrict it to the filemerge code. This is already somewhat supported via: ctx.filectx(f, fileid=nullid) Indeed, for add/add conflicts (ancestor doesn't have the file) we use precisely that. However, that is broken in subtle ways: - The cmp() function in filectx returns False (identical) for such a filectx when compared to a zero-length file. - size() returns 0 rather than some sort of value indicating that the file isn't present. - data() returns '' rather than some sort of value indicating that the file isn't present. Given the relatively niche use of such filectxes, this seems to be the simplest way to fix all these issues.

filectx: add isabsent method This will indicate whether this filectx represents a file that is *not* in a changectx. This will be used by merge and filemerge code to know about when a conflict is a change/delete conflict. While this is kind of hacky, it is the least bad of all the alternatives. Other options considered but rejected include: - isinstance(fctx, ...) -- not very Pythonic, doesn't support duck typing - fctx.size() is None -- the 'size()' call on workingfilectxes causes a disk stat - fctx.filenode() == nullid -- the semantics around filenode are incredibly confusing. In particular, for workingfilectxes, filenode() is always None no matter whether the file is present on disk or in either parent. Having different behavior for None versus nullid in the merge code is just asking for pain. Thanks to Pierre-Yves David for early review feedback here.

filectx: allow custom comparators We're going to introduce other sorts of filectxes very soon, and we'd like the cmp method to function properly (i.e. commutatively) for them. The only way to make that happen is for this cmp method to call into that specialized one if that defines a custom comparator.

debugmergestate: print out record type for files We're going to add a separate record type for change/delete conflicts soon. We need to make sure they get stored with the correct record type so that older versions of Mercurial correctly abort when they see change/delete records.

merge.applyupdates: don't return early if merge driver's conclude failed Somewhat silly oversight -- this prevented the progress bar from being reset.

convert: use repo._bookmarks.recordchange instead of repo._bookmarks.write Before this patch, convert was using repo._bookmarks.write, a deprecated API for saving bookmarks. This patch changes the use of repo._bookmarks.write to repo._bookmarks.recordchange.