Summary:
D27144492 (48cd15ab14) broke hg undo -i by changing the way integers are formatted
into revsets. This was done to do some rev validation, but undo used the integer
formatting for non-rev cases and this broke undo's usage. Let's just move to
normal python string formatting for undo's case.
The migration to Python 3 also broke hg undo -i by causing the repr() output to
change, which messes up the interactive ui handling. Let's fix that as well, and
drop the repr stuff.
Reviewed By: zzl0
Differential Revision: D39892760
fbshipit-source-id: 96655f743e4187f7345f7f3c6a2fe74fb326335e
