Fixes error when dropdown button is focused

Editor assessment

The subject names the trigger, an error when the dropdown button is focused, and fix is the right type, but 'Fixes error' never says what the error was, a JavaScript exception or a visual glitch, or what the correction does, so the diff is mandatory. The doubled verb-form 'Fixes error' also reads clumsily. No scope, no body, no footers beyond Co-authored-by. The trailing pull-request number is conventional. Hygiene otherwise fine. Understandable as a trigger description and uninformative about the fault.