Bug 40074 [navigation] Selection reset to previous item when arrowing in outline
build I20030710 - open a Java editor on a class with several methods - in the outline, select the first method - use the arrow key to go down one item - as soon as the delay passes and the new text range is selected, use the arrow key to go down another item - after the delay, the selection is reset back to the previous item
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
* Whether quick diff information is displayed, either on a change ruler or the line number ruler.
	 * @since 3.0
	 */
	private boolean fIsChangeInformationShown;
		
	/**
	 * Returns the most narrow java element including the given offset.
	 * 
	 * @param offset the offset inside of the requested element
	 * @return the most narrow java element
	 */
	abstract protected IJavaElement getElementAt(int offset);
	
	/**
	 * Returns the java element of this editor's input corresponding to the given IJavaElement
	 */
	abstract protected IJavaElement getCorrespondingElement(IJavaElement element);
	
	/**
	 * Sets the input of the editor's outline page.
	 */
	abstract protected void setOutlinePageInput(JavaOutlinePage page, IEditorInput input);
	
	
	/**
	 * Default constructor.
	 */
	public JavaEditor() {
		super();
		JavaTextTools textTools= JavaPlugin.getDefault().getJavaTextTools();