dirstate.remove: during merges, remember the previous file state We encode the previous state as a negative file size (AFAICS, previous versions of hg always have size == 0 when state == 'r'). We save the state of 'm'erged and dirty files, because they're the two states that indicate that a file has to be committed on a merge to correctly record per-file history.

merging foo1 and foo
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
n   0         -2 bar
m 644         14 foo1
copy: foo -> foo1
M bar
M foo1
% removing foo1 and bar
r   0         -2 bar
r   0         -1 foo1
copy: foo -> foo1
R bar
R foo1
  foo