tests/test-update-branches.out

merge: fix --preview to show all nodes that will be merged (issue2043).

Formerly, it omitted nodes that were not descendants of the least
common ancestor of the two merge parents, even though those nodes
contribute to the merge.  The new algorithm uses revlog.findmissing()
instead of ancestor() + nodesbetween().

% initial repo state

@  5:e1bb631146ca  b1
|
o  4:a4fdb3b883c4 0:b608b9236435  b1
|
| o  3:4b57d2520816 1:44592833ba9f
| |
| | o  2:063f31070f65
| |/
| o  1:44592833ba9f
|/
o  0:b608b9236435

% norevtest none clean linear 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=5
% norevtest none clean same 2
abort: crosses branches (use 'hg merge' or use 'hg update -c')
parent=2
% revtest none clean linear 1 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
% revtest none clean same 2 3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=3
% revtest none clean cross 3 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=4
% revtest none dirty linear 1 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
M foo
% revtest none dirty same 2 3
abort: crosses branches (use 'hg merge' to merge or use 'hg update -C' to discard changes)
parent=2
M foo
% revtest none dirty cross 3 4
abort: crosses branches (use 'hg merge' to merge or use 'hg update -C' to discard changes)
parent=3
M foo
% revtest -C dirty linear 1 2
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
% revtest -c dirty linear 1 2
abort: uncommitted local changes
parent=1
M foo
% norevtest -c clean same 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=3
% revtest -cC dirty linear 1 2
abort: cannot specify both -c/--check and -C/--clean
parent=1
M foo