fix: reset activeIndex after choices have been updated

src/components/ComboBox.vue

@@ -225,6 +225,13 @@ watchEffect(() => {
   activeIndex.value = clamp(activeIndex.value, 0, lastChoiceIndex.value)
 })
 
+watch(
+  () => props.choices,
+  () => {
+    activeIndex.value = 0
+  },
+)
+
 watch(hasFocus, (hasFocus, hadFocus) => {
   if (hasFocus && !hadFocus) {
     open()