Bug 119615 [PropertiesDialog] Can no longer change read-only property
I20051206-1200 1. open the properties for a file 2. change the read-only property 3. close 4. open the properties dialog again ==> state did not change
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceInfoPage.java
previousReadOnlyValue = previousExecutableValue = previousArchiveValue = false;
			}
			previousDerivedValue = resource.isDerived();
		}
		
		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginWidth = 0;
		layout.marginHeight = 0;
		composite.setLayout(layout);
		GridData data = new GridData(GridData.FILL);
		data.grabExcessHorizontalSpace = true;
		composite.setLayoutData(data);
		composite.setFont(parent.getFont());
		createBasicInfoGroup(composite, resource);
		createSeparator(composite);
		createStateGroup(composite, resource);
		new Label(composite, SWT.NONE); 
		encodingEditor = new ResourceEncodingFieldEditor(
				getFieldEditorLabel(resource), composite, resource);
		encodingEditor.setPage(this);
		encodingEditor.load();
		encodingEditor.setPropertyChangeListener(new IPropertyChangeListener() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
			 */
			public void propertyChange(PropertyChangeEvent event) {
				if (event.getProperty().equals(FieldEditor.IS_VALID))