Bug 184602 [Progress] "Widget is disposed" when setting builders twice during build
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/ProgressMonitorDialog.java
nestingDepth++;
	}
	/**
	 * Decrements the nesting depth of running operations.
	 * 
	 * @since 3.0
	 * 
	 */
	protected void decrementNestingDepth() {
		nestingDepth--;
	}
	/**
	 * Called just before the operation is run. Default behaviour is to open or
	 * create the dialog, based on the setting of <code>getOpenOnRun</code>,
	 * and increment the nesting depth.
	 * 
	 * @since 3.0
	 */
	protected void aboutToRun() {
		if (getOpenOnRun()) {
			open();
		} else {
			create();
		}
		incrementNestingDepth();
	}
	/**
	 * Called just after the operation is run. Default behaviour is to decrement
	 * the nesting depth, and close the dialog.
	 *