repair: setup hookargs when processing bundle2s
addchangegroup() modifies its behavior based on the transaction source.
This is incorrect for bundle2 repair files, causing rebases to abort when this
option is enabled.
This diff specifies the source type in the way recommended by comments in
bundle2.py and adds a test to ensure that rebases with the experimental option
work successfully.
amend: check for directory renames for both merge parents (
issue4516)
Before this change, amending a merge would lose the rename information for file
adding in the second parents and implicitly renamed into a new directory.
In case of the merge, we also look for directory rename data from the second
parent. This seems to fix the bug and does not show other issues from the test
suite.