EvenlySpreadAssignmentStrategy doesn't take global state into account

[phoenigm]

EvenlySpreadAssignmentStrategy moves all work items from previous assignment.
Further, in order to make a balance for each job, this strategy makes the transfer of the work item from the most busy to the less busy.
After this, a situation arises that each job is balanced.
But it does not take into account the global state.
It can, without breaking the balance of each job, make newAssignmentState closer to the global balance.
You also need to keep in mind the possibility that another custom strategy was used before this strategy, and because of this, a global balance is not always possible.