Bug 77649 'Refactor -> Undo' enabled after consecutive change
I200411022000 Having: package test2; public class A { public C c= new C(); public void foo() { } } package test2; public class B { public void bar() { new A().foo(); } } package test2; public class C { } and: - open all 3 CUs - move A#foo() to C - remove 'a' from 'new A().c.foo(a);' in B - save B - Refactor -> Undo -> lost parenthesis in B because undo did no longer match
org.eclipse.ltk.core.refactoring/src/org/eclipse/ltk/core/refactoring/IUndoManager.java
* @param change the change to be performed.
	 */
	public void aboutToPerformChange(Change change);
	
	/**
	 * The infrastructure has performed the given change.
	 * 
	 * @param change the change that was performed
	 */
	public void changePerformed(Change change);
	/**
	 * Adds a new undo change to this undo manager.
	 * 
	 * @param name the name presented on the undo stack for the provided
	 *  undo change. The name must be human readable.
	 * @param change the undo change
	 */
	public void addUndo(String name, Change change);
	/**
	 * Returns <code>true</code> if there is anything to undo, otherwise
	 * <code>false</code>.
	 * 
	 * @return <code>true</code> if there is anything to undo, otherwise
	 *  <code>false</code>
	 */
	public boolean anythingToUndo();
	
	/**
	 * Returns the name of the top most undo.
	 *