view tests/test-debugindexdot.out @ 5810:124577de40a7

context: preserve changeset in filectx if we have one

If we know original changeset we are working with - try hard to
preserve it. Fallback to filelog.linkrev() only if we have no way
to get original changeset, since linkrev() may point to other
changeset.

digraph G {
	-1 -> 0
	0 -> 1
	0 -> 2
	2 -> 3
	1 -> 3
}