Make ToolItem non focusable by mouse

On Windows (at least), the ToolItem/ToolBar is not focusable by mouse
regardless SWT.NO_FOCUS style flag. This flag only affects tab
traversal.

Bug 519499: Toolbar Get / Lost Focus events handles different from SWT
https://bugs.eclipse.org/bugs/show_bug.cgi?id=519499

Change-Id: I2e081a18aa21bab8cc013d0ace9d79a569fe4d1b

bundles/org.eclipse.rap.rwt/js/rwt/event/EventHandlerUtil.js

diff --git a/bundles/org.eclipse.rap.rwt/js/rwt/event/EventHandlerUtil.js b/bundles/org.eclipse.rap.rwt/js/rwt/event/EventHandlerUtil.js
index c9c55d3..d703547 100644
--- a/bundles/org.eclipse.rap.rwt/js/rwt/event/EventHandlerUtil.js
+++ b/bundles/org.eclipse.rap.rwt/js/rwt/event/EventHandlerUtil.js
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2004, 2018 1&1 Internet AG, Germany, http://www.1und1.de,
+ * Copyright (c) 2004, 2020 1&1 Internet AG, Germany, http://www.1und1.de,
  *                          EclipseSource, and others.
  *
  * All rights reserved. This program and the accompanying materials
@@ -203,7 +203,9 @@
       if( root ) {
         var focusTarget = target;
         while( !focusTarget.isFocusable() && focusTarget != root ) {
-          if( focusTarget instanceof rwt.widgets.MenuBar ) {
+          if(    focusTarget instanceof rwt.widgets.MenuBar
+              || focusTarget instanceof rwt.widgets.ToolItem )
+          {
             return;
           }
           focusTarget = focusTarget.getParent();