Notifications: email subscriptions - show tooltip for disabled save button (#103340)

Author: simison

client/me/notification-settings/reader-subscriptions/index.jsx

@@ -343,7 +343,10 @@ class NotificationSubscriptions extends Component {
 						) }
 
 						<Button
+							accessibleWhenDisabled
 							variant="primary"
+							showTooltip={ ! this.props.hasUnsavedUserSettings }
+							label={ this.props.translate( 'No unsaved changes' ) }
 							disabled={ this.props.isUpdatingUserSettings || ! this.props.hasUnsavedUserSettings }
 							isBusy={ this.props.isUpdatingUserSettings }
 							onClick={ this.handleSubmitButtonClick }