do not suppress ArrowLeft, ArrowRight to allow keyboard navigation

packages/button/src/vaadin-button-mixin.js

@@ -92,8 +92,18 @@ export const ButtonMixin = (superClass) =>
 
     /** @private */
     __onInteractionEvent(event) {
-      if (this.disabled) {
+      if (this.__shouldSuppressInteractionEvent(event)) {
         event.stopImmediatePropagation();
       }
     }
+
+    /**
+     * Returns whether to suppress interaction events like `click`, `keydown`, etc.
+     * By default suppresses all interaction events when the button is disabled.
+     *
+     * @private
+     */
+    __shouldSuppressInteractionEvent(_event) {
+      return this.disabled;
+    }
   };

packages/menu-bar/src/vaadin-lit-menu-bar-button.js

@@ -53,16 +53,14 @@ class MenuBarButton extends Button {
    * Override method inherited from `ButtonMixin` to allow keyboard navigation with
    * arrow keys in the menu bar when the button is focusable in the disabled state.
    *
-   * @param {Event} event
    * @override
-   * @protected
    */
-  _shouldSuppressInteractionEvent(event) {
+  __shouldSuppressInteractionEvent(event) {
     if (event.type === 'keydown' && ['ArrowLeft', 'ArrowRight'].includes(event.key)) {
       return false;
     }
 
-    return super._shouldSuppressInteractionEvent(event);
+    return super.__shouldSuppressInteractionEvent(event);
   }
 }
 

packages/menu-bar/src/vaadin-menu-bar-button.js

@@ -50,16 +50,14 @@ class MenuBarButton extends Button {
    * Override method inherited from `ButtonMixin` to allow keyboard navigation with
    * arrow keys in the menu bar when the button is focusable in the disabled state.
    *
-   * @param {Event} event
    * @override
-   * @protected
    */
-  _shouldSuppressInteractionEvent(event) {
+  __shouldSuppressInteractionEvent(event) {
     if (event.type === 'keydown' && ['ArrowLeft', 'ArrowRight'].includes(event.key)) {
       return false;
     }
 
-    return super._shouldSuppressInteractionEvent(event);
+    return super.__shouldSuppressInteractionEvent(event);
   }
 }