Clear all selected items

Fixes cases where more than one item is marked as selected. This
state shouldn't be possible inside combobox-nav but might happen in the
host application.

Co-authored-by: Mu-An Chiou <[email protected]>

Author: dgraham

combobox-nav.js

@@ -111,9 +111,9 @@ export function navigate(
 
 export function clearSelection(input: HTMLTextAreaElement | HTMLInputElement, list: HTMLElement): void {
   input.removeAttribute('aria-activedescendant')
-  const target = list.querySelector('[aria-selected="true"]')
-  if (!target) return
-  target.setAttribute('aria-selected', 'false')
+  for (const el of list.querySelectorAll('[aria-selected="true"]')) {
+    el.setAttribute('aria-selected', 'false')
+  }
 }
 
 function trackComposition(event: Event): void {