From f3dcf6bc79dde698e0504a4fc3eed3b94793d565 Mon Sep 17 00:00:00 2001
From: Jesse Greenberg <jesse.greenberg@colorado.edu>
Date: Wed, 10 Apr 2019 10:38:30 -0600
Subject: [PATCH] use single Utterance instead of uniqueGroupId, see
 phetsims/scenery-phet#485

---
 js/faradays-law/view/FaradaysLawAlertManager.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/js/faradays-law/view/FaradaysLawAlertManager.js b/js/faradays-law/view/FaradaysLawAlertManager.js
index a6f132b6..2d53310c 100644
--- a/js/faradays-law/view/FaradaysLawAlertManager.js
+++ b/js/faradays-law/view/FaradaysLawAlertManager.js
@@ -14,6 +14,10 @@ define( require => {
 
     constructor( describer  ) {
       this.describer = describer;
+
+      // @private {Utterance} - utterance for end of a keyboard movement, single utterance
+      // gets added to the utteranceQueue to prevent too many alerts with this content
+      this.keyboardMovementUtterance = new Utterance();
     }
 
     magnetFocusAlert() {
@@ -22,8 +26,8 @@ define( require => {
     }
 
     movementEndAlert() {
-      const alert = new Utterance( { alert: this.describer.magnetMovedAlertText(), uniqueGroupId: 'keyboardMove' } );
-      utteranceQueue.addToFront( alert );
+      this.keyboardMovementUtterance.alert = this.describer.magnetMovedAlertText(); 
+      utteranceQueue.addToFront( this.keyboardMovementUtterance );
     }
 
     flipMagnetAlert( orientation ) {