tests: introduce tests for grafting through renames These cover all currently known cases of renames being grafted, or changes being grafted through renames. Right now, most of these cases are broken. Later patches in this series will make them behave correctly. The testcases heavily rely on each other, which would make it very difficult to separate them and add them one-by-one for each case fixed by a patch. Separating them should perhaps be a 4.1 task, if it doesn't slow down the tests too much. (Developed together with Pierre-Yves David)

largefiles: fix 'deleted' files sometimes persistently appearing with R status A code snippet that has been around since largefiles was introduced was wrong: Standins no longer found in lfdirstate has *not* been removed - they have probably just been deleted ... or not created. This wrong reporting did that 'up -C' didn't undo the change and didn't sync the two dirstates. Instead of reporting such files as removed, propagate the deletion to the standin file and report the file as deleted.

largefiles: more safe handling of interruptions while updating modifications Largefiles are fragile with the design where dirstate and lfdirstate must be kept in sync. To be less fragile, mark all clean largefiles as unsure ("normallookup") before updating standins. After standins have been updated and we know exactly which largefile standins actually was changed, mark the unchanged largefiles back to clean ("normal"). This will make the failure mode more safe. If interrupted, the next command will continue to perform extra hashing of all largefiles. That will do that all largefiles that are out of sync with their standin will be marked dirty and they will show up in status and can be cleaned with update --clean.