Bug 40785 [plan item] Overview ruler improvements
- navigation from ruler to editor - hovering over header area shows number of errors/warning (header annotations in general)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
String property= event.getProperty();	
			
			if (PreferenceConstants.EDITOR_TAB_WIDTH.equals(property)) {
				Object value= event.getNewValue();
				if (value instanceof Integer) {
					sourceViewer.getTextWidget().setTabs(((Integer) value).intValue());
				} else if (value instanceof String) {
					sourceViewer.getTextWidget().setTabs(Integer.parseInt((String) value));
				}
				return;
			}
			
			if (isJavaEditorHoverProperty(property))
				updateHoverBehavior();
			
			if (BROWSER_LIKE_LINKS.equals(property)) {
				if (isBrowserLikeLinks())
					enableBrowserLikeLinks();
				else
					disableBrowserLikeLinks();
				return;
			}
			
			if (PreferenceConstants.EDITOR_SYNC_OUTLINE_ON_CURSOR_MOVE.equals(property)) {
				if ((event.getNewValue() instanceof Boolean) && ((Boolean)event.getNewValue()).booleanValue()) {
					fEditorSelectionChangedListener= new EditorSelectionChangedListener();
					fEditorSelectionChangedListener.install(getSelectionProvider());
					fEditorSelectionChangedListener.selectionChanged();
				} else {