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
public void run() {
			clearCollector(this);
			if (subTask != null)
				monitor.subTask(subTask);
			if (worked > 0)
				monitor.internalWorked(worked);
		}
	}		
/**
 * Creates an accumulating progress monitor wrapping the given one
 * that uses the given display.
 * 
 * @param monitor the actual progress monitor to be wrapped
 * @param display the SWT display used to forward the calls 
 *  to the wrapped progress monitor
 */
public AccumulatingProgressMonitor(IProgressMonitor monitor, Display display) {
	super(monitor);
	Assert.isNotNull(display);
	this.display = display;
}
/* (non-Javadoc)
 * Method declared on IProgressMonitor.
 */
public void beginTask(final String name, final int totalWork) {
	synchronized(this) {
		collector = null;
	}	
	display.syncExec(new Runnable() {
		public void run() {