fix(Combobox): highlight element for async options (#2290)

* fix highlighting element

* get oldValue

Author: dominikjasek

packages/core/src/Combobox/ComboboxInput.vue

@@ -96,10 +96,10 @@ watch(rootContext.modelValue, async () => {
     resetSearchTerm()
 }, { immediate: true, deep: true })
 
-watch(rootContext.filterState, () => {
+watch(rootContext.filterState, (_newValue, oldValue) => {
   // we exclude virtualized list as the state would be constantly updated,
-  // and only change highlight when there is no highlighted item
-  if (!rootContext.isVirtual.value && !rootContext.highlightedElement.value) {
+  // and only change highlight when previously there were no items displayed
+  if (!rootContext.isVirtual.value && (oldValue.count === 0)) {
     listboxContext.highlightFirstItem()
   }
 })