231205 deadlock closing edited orm.xml file

bundles/org.eclipse.wst.xml.core/src-emfModelSynch/org/eclipse/wst/xml/core/internal/emf2xml/EMF2DOMSSERenderer.java

diff --git a/bundles/org.eclipse.wst.xml.core/src-emfModelSynch/org/eclipse/wst/xml/core/internal/emf2xml/EMF2DOMSSERenderer.java b/bundles/org.eclipse.wst.xml.core/src-emfModelSynch/org/eclipse/wst/xml/core/internal/emf2xml/EMF2DOMSSERenderer.java
index 7b6eb86..8b23e11 100644
--- a/bundles/org.eclipse.wst.xml.core/src-emfModelSynch/org/eclipse/wst/xml/core/internal/emf2xml/EMF2DOMSSERenderer.java
+++ b/bundles/org.eclipse.wst.xml.core/src-emfModelSynch/org/eclipse/wst/xml/core/internal/emf2xml/EMF2DOMSSERenderer.java
@@ -393,7 +393,12 @@
 	}
 
 	public boolean isShared() {
-		if (getResourceSet() == null || xmlModel == null)
+		
+		if( xmlModel == null) { //resource could be in process of being unloaded - check with model manager
+			String id = getModelManagerId();
+			return getModelManager().isShared(id);
+		}
+		if (getResourceSet() == null)
 			return false;
 		return xmlModel.isShared();
 	}