What is the test for qualified immunity from civil damages in a civil action brought by a plaintiff who alleges that she was sexually harassed by a member of her staff while on duty?

Government officials enjoy qualified immunity from civil damages unless their conduct violates "clearly established statutory or constitutional rights of which a reasonable person would have known." Harlow v. Fitzgerald, 457 U.S. 800, 818 (1982). "Qualified immunity balances two important interests - the need to hold public officials accountable when they exercise power irresponsibly and the need to shield officials from harassment, distraction, and liability when they perform their duties reasonably," Pearson v. Callahan, 555 U.S. 223, 231 (2009), and it protects "all but the plainly incompetent or those who knowingly violate the law," Malley v. Briggs, 475 U.S. 335, 341 (1986).