Also clear when x button pressed

app/components/primer/alpha/select_panel_element.ts

@@ -165,7 +165,7 @@ export class SelectPanelElement extends HTMLElement {
   updateAnchorPosition() {
     // If the selectPanel is removed from the screen on resize close the dialog
     if (this && this.offsetParent === null) {
-      this.dialog.close()
+      this.hide()
     }
 
     if (this.invokerElement) {
@@ -464,6 +464,8 @@ export class SelectPanelElement extends HTMLElement {
       // Remove data-ready so it can be set the next time the panel is opened
       this.dialog.removeAttribute('data-ready')
       this.invokerElement?.setAttribute('aria-expanded', 'false')
+      // When we close the dialog, clear the filter input
+      this.filterInputTextField.value = ''
 
       this.dispatchEvent(
         new CustomEvent('panelClosed', {
@@ -935,8 +937,6 @@ export class SelectPanelElement extends HTMLElement {
   }
 
   hide() {
-    // When we close the dialog, clear the filter input
-    this.filterInputTextField.value = ''
     this.dialog.close()
   }
 

test/system/alpha/select_panel_test.rb

@@ -435,7 +435,7 @@ def test_single_selected_item_cannot_be_unchecked
       refute_selector "[aria-checked]", visible: :hidden
     end
 
-    def test_single_select_clears_input_on_close
+    def test_single_select_clears_input_on_selection
       visit_preview(:single_select)
 
       click_on_invoker_button
@@ -453,6 +453,40 @@ def test_single_select_clears_input_on_close
       assert_selector "select-panel input", text: ""
     end
 
+    def test_single_select_clears_input_on_enter
+      visit_preview(:single_select)
+
+      click_on_invoker_button
+
+      filter_results(query: "it")
+
+      keyboard.type(:enter)
+
+      assert_selector "[aria-selected=true]", text: "Item 1", visible: :hidden
+
+      click_on_invoker_button
+
+      # Check that the input value is empty
+      assert_selector "select-panel input", text: ""
+    end
+
+    def test_single_select_clears_input_on_close
+      visit_preview(:single_select)
+
+      click_on_invoker_button
+
+      filter_results(query: "it")
+
+      click_on_x_button
+
+      assert_no_selector "[aria-selected=true]", text: "Item 1", visible: :hidden
+
+      click_on_invoker_button
+
+      # Check that the input value is empty
+      assert_selector "select-panel input", text: ""
+    end
+
     def test_single_select_disabled_item_cannot_be_checked
       visit_preview(:single_select)