evolve: add a test reflecting wrong behaviour of content-div resolution
This patch shows that currently the case when stack of divergent csets
have different parents is not handled correctly.
For a stack of csets which has different parent, right behaviour is to
relocate every node before performing merge but present implementation
only relocate first cset in the stack and skip relocation for the rest
of csets, this is not what we expect it to do.
Next patch will be about fixing this issue.