Bug 60907 Two progress dialogs when building WS + dragging a file into the navigator
build N20040503 - start the workspace - delete a view_menu.gif file from org.eclipse.ui\icons... - note for me that a build starts now - drag another file from the file system while the build is happening - drop it on the folder where the first file was deleted from two progress dialogs appear... see attachment.
bundles/org.eclipse.jface/src/org/eclipse/jface/operation/AccumulatingProgressMonitor.java
currentTask = name;
			getWrappedProgressMonitor().beginTask(name, totalWork);
		}
	});
}
/**
 * Clears the collector object used to accumulate work and subtask calls
 * if it matches the given one.
 */
private synchronized void clearCollector(Collector collector) {
	
	
	if (this.collector == collector)
		this.collector = null;
}
/**
 * Creates a collector object to accumulate work and subtask calls.
 */
private void createCollector(String subTask, double work) {
	collector = new Collector(subTask, work, getWrappedProgressMonitor());
	display.asyncExec(collector);
}
/* (non-Javadoc)
 * Method declared on IProgressMonitor.
 */
public void done() {
	synchronized(this) {
		collector= null;
	}	
	display.syncExec(new Runnable() {