Bug 62896 [misc] Quick Outline should not show override indicators if decorator disabled
I20040519 The quick outline shows override indicators no matter whether the Override indicator decorator is enabled in the prefs or not. We should only install the decorator if the prefs says so since this is a performance saver.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/JavaOutlineInformationControl.java
private static final String STORE_GO_INTO_TOP_LEVEL_TYPE_CHECKED= "GoIntoTopLevelTypeAction.isChecked"; 
		
		private TreeViewer fOutlineViewer;
		private ShowOnlyMainTypeAction(TreeViewer outlineViewer) {
			super(TextMessages.getString("JavaOutlineInformationControl.GoIntoTopLevelType.label"), IAction.AS_CHECK_BOX); 
			setToolTipText(TextMessages.getString("JavaOutlineInformationControl.GoIntoTopLevelType.tooltip")); 
			setDescription(TextMessages.getString("JavaOutlineInformationControl.GoIntoTopLevelType.description")); 
			
			JavaPluginImages.setLocalImageDescriptors(this, "gointo_toplevel_type.gif"); 
			
			WorkbenchHelp.setHelp(this, IJavaHelpContextIds.GO_INTO_TOP_LEVEL_TYPE_ACTION);
			
			fOutlineViewer= outlineViewer;
			boolean showclass= getDialogSettings().getBoolean(STORE_GO_INTO_TOP_LEVEL_TYPE_CHECKED);
			setTopLevelTypeOnly(showclass);
		}