fixup! fix(cdk-experimental/combobox): refactor combobox filtering

Author: wagnermaciel

src/cdk-experimental/ui-patterns/combobox/combobox.spec.ts

@@ -68,6 +68,7 @@ function _type(
   firstMatch: WritableSignal<string | undefined>,
   backspace = false,
 ) {
+  combobox.onFocusIn();
   inputEl.value = text;
   combobox.onInput(
     backspace

src/cdk-experimental/ui-patterns/combobox/combobox.ts

@@ -286,6 +286,11 @@ export class ComboboxPattern<T extends ListItem<V>, V> {
       return;
     }
 
+    // Avoid refocusing the input if a filter event occurs after focus has left the combobox.
+    if (!this.isFocused()) {
+      return;
+    }
+
     if (this.inputs.popupControls()?.role() === 'tree') {
       const treeControls = this.inputs.popupControls() as ComboboxTreeControls<T, V>;
       this.inputs.inputValue?.().length ? treeControls.expandAll() : treeControls.collapseAll();