revert: add some inline comments I spend some time understanding how this part of the revert code is working. I'm adding some comments to help the code readability. I expect most of them to disappear in a coming refactoring. But the refactoring should be easier to follow with the comment.

revert: cosmetic align of the dispatch table This changeset make a minimal cosmetic change to help readability of the value in this table.

revert: add a test case to reverting "add" during merges This kind of revert is specifically trickier since the file is reported as "modified" by status. This case was only tested by some largefiles test. We introduce proper testing of all aspects of this case in the revert tests themselves.

alias: change return code of bad definition to 255 We use 255 for general command error. It can't raise util.Abort because help module executes badalias command to get error message.