fixed/added nls wizard syntax highlighting in preview

ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/nls/ExternalizeStringsWizardPage.java

diff --git a/ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/nls/ExternalizeStringsWizardPage.java b/ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/nls/ExternalizeStringsWizardPage.java
index 83b4691..12386f5 100644
--- a/ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/nls/ExternalizeStringsWizardPage.java
+++ b/ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/nls/ExternalizeStringsWizardPage.java
@@ -30,6 +30,8 @@
 import org.eclipse.pde.core.plugin.IPluginModelBase;
 import org.eclipse.pde.internal.ui.PDEPlugin;
 import org.eclipse.pde.internal.ui.PDEUIMessages;
+import org.eclipse.pde.internal.ui.editor.XMLConfiguration;
+import org.eclipse.pde.internal.ui.editor.text.ColorManager;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.SashForm;
 import org.eclipse.swt.events.ModifyEvent;
@@ -158,7 +160,8 @@
 	private String fPreErrorKey;
 
 	private IDocument fEmptyDoc;
-//	private ColorManager fColorManager;
+	private ColorManager fColorManager;
+	private XMLConfiguration fXMLConfig;
 	
 	protected ExternalizeStringsWizardPage(ModelChangeTable changeTable) {
 		super(PAGE_NAME);
@@ -192,13 +195,14 @@
 				}
 			}
 		};
+		fColorManager = new ColorManager();
+		fXMLConfig = new XMLConfiguration(fColorManager);
 	}
 	
-//	public void dispose() {
-//		if (fColorManager != null)
-//			fColorManager.dispose();
-//		super.dispose();
-//	}
+	public void dispose() {
+		fColorManager.dispose();
+		super.dispose();
+	}
 	
 	public void createControl(Composite parent) {
 
@@ -374,10 +378,10 @@
 		label.setText(PDEUIMessages.ExternalizeStringsWizardPage_sourceLabel);
 		label.setLayoutData(new GridData());
 
-		fSourceViewer = new SourceViewer(composite, null, SWT.V_SCROLL | SWT.H_SCROLL | SWT.MULTI | SWT.BORDER | SWT.FULL_SELECTION);
-		fSourceViewer.getControl().setFont(JFaceResources.getTextFont());
-		fSourceViewer.getControl().setLayoutData(new GridData(GridData.FILL_BOTH));
+		fSourceViewer = new SourceViewer(composite, null, SWT.V_SCROLL | SWT.H_SCROLL | SWT.BORDER);
 		fSourceViewer.setEditable(false);
+		fSourceViewer.getTextWidget().setFont(JFaceResources.getTextFont());
+		fSourceViewer.getControl().setLayoutData(new GridData(GridData.FILL_BOTH));
 		
 		fEmptyDoc = new Document();
 		fSourceViewer.setDocument(fEmptyDoc);
@@ -430,15 +434,11 @@
 		TreeItem item = fInputViewer.getTree().getSelection()[0];
 		IPluginModelBase model = ((ModelChange)item.getParentItem().getData()).getParentModel();
 		
-//		if (fSourceViewer.getDocument() != null && !fSourceViewer.getDocument().equals(fEmptyDoc))
-//			fSourceViewer.unconfigure();
-//		if (sourceFile.getFileExtension().equalsIgnoreCase("xml")) { //$NON-NLS-1$
-//			if (fColorManager != null) {
-//				fColorManager.dispose();
-//			}
-//			fColorManager = new ColorManager();
-//			fSourceViewer.configure(new XMLConfiguration(fColorManager));
-//		}
+		if (fSourceViewer.getDocument() != null)
+			fSourceViewer.unconfigure();
+		if (sourceFile.getFileExtension().equalsIgnoreCase("xml")) { //$NON-NLS-1$
+			fSourceViewer.configure(fXMLConfig);
+		}
 		
 		fSourceViewer.setDocument(document);
 		updatePropertiesLabel(model);