Bug 75711 AstProvider should not create AST if requested by SelectionListenerWithASTManager
3.1 M2 If SelectionListenerWithASTManager waits for an AST and the editor closes we should not create an AST for that one but return null instead.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/ASTProvider.java
fWaitLock.notify();
		}
	}
	
	/*
	 * @see org.eclipse.jdt.internal.ui.text.java.IJavaReconcilingListener#reconciled(org.eclipse.jdt.core.dom.CompilationUnit)
	 */
	void reconciled(CompilationUnit ast, IJavaElement javaElement) {
		
		if (DEBUG)
			System.out.println(DEBUG_PREFIX + "reconciled AST: " + toString(ast)); 
		synchronized (fReconcileLock) {
		
			fIsReconciling= false;
			if (javaElement == null || !javaElement.equals(fReconcilingJavaElement)) {
				
				if (DEBUG)
					System.out.println(DEBUG_PREFIX + "  ignoring AST of out-dated editor"); 
				
				synchronized (fWaitLock) {
					fWaitLock.notifyAll();
				}
				return;
			}
			
			cache(ast, javaElement);
		}
	}
}