fix(dialog): add property to customize suppressDefaultPressSelector

PiperOrigin-RevId: 351683721

Author: asyncLiz

packages/mdc-dialog/README.md

@@ -425,6 +425,8 @@ Method Signature | Description
 `handleClick(event: MouseEvent)` | Handles `click` events on or within the dialog's root element.
 `handleKeydown(event: KeyboardEvent)` | Handles `keydown` events on or within the dialog's root element.
 `handleDocumentKeydown(event: Event)` | Handles `keydown` events on or within the document while the dialog is open.
+`getSuppressDefaultPressSelector() => string` | Returns the selector string for elements that suppress the default dialog press action, such as pressing enter in a textarea.
+`setSuppressDefaultPressSelector(selector: string)` | Customize the selector string to suppress the default dialog press action. An empty string indicates that no elements should suppress the default action.
 
 #### Event handlers
 

packages/mdc-dialog/foundation.ts

@@ -228,8 +228,10 @@ export class MDCDialogFoundation extends MDCFoundation<MDCDialogAdapter> {
     //   </horizontal-layout>
     // </mwc-dialog>
     const target = evt.composedPath ? evt.composedPath()[0] : evt.target;
-    const isDefault = !this.adapter.eventTargetMatches(
-        target, this.suppressDefaultPressSelector);
+    const isDefault = this.suppressDefaultPressSelector ?
+        !this.adapter.eventTargetMatches(
+            target, this.suppressDefaultPressSelector) :
+        true;
     if (isEnter && isDefault) {
       this.adapter.clickDefaultButton();
     }