Whether all ineffective assistance of counsel claims are assessed under the Strickland error-and-prejudice rule, or whether such claims based on a single error by counsel require an additional more demanding showing that the error involved an issue that was 'clear-cut and dispositive'

QUESTION PRESENTED Whether all ineffective assistance of counsel claims are assessed under the Strickland error-and-prejudice rule, or whether such claims based on a single error by counsel require an additional more demanding showing that the error involved an issue that was “clear-cut and dispositive.” i