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
setDescription(TextMessages.getString("JavaOutlineInformationControl.LexicalSortingAction.description")); 
			
			JavaPluginImages.setLocalImageDescriptors(this, "alphab_sort_co.gif"); 
			
			fOutlineViewer= outlineViewer;
			
			boolean checked=getDialogSettings().getBoolean(STORE_LEXICAL_SORTING_CHECKED);
			setChecked(checked);
			WorkbenchHelp.setHelp(this, IJavaHelpContextIds.LEXICAL_SORTING_BROWSING_ACTION);
		}
		public void run() {
			valueChanged(isChecked(), true);
		}
		private void valueChanged(final boolean on, boolean store) {
			setChecked(on);
			BusyIndicator.showWhile(fOutlineViewer.getControl().getDisplay(), new Runnable() {
				public void run() {
					fOutlineViewer.refresh(false);
				}
			});
			
			if (store)
				getDialogSettings().put(STORE_LEXICAL_SORTING_CHECKED, on);
		}
	}
	private class SortByDefiningTypeAction extends Action {
		
		private static final String STORE_SORT_BY_DEFINING_TYPE_CHECKED= "SortByDefiningType.isChecked"; 
		
		private TreeViewer fOutlineViewer;