* Impl dynamic window size. Keep sessions for unfinalized chain Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * feedback Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * Stretch also in contructor plus tests Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * review feedback Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * fix approval-voting tests Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * grunting: dispute coordinator tests Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>