Bug 180758 [IDE] Deleting a project but not the contents asks if you want to delete read-only files
I have noticed that in 3.3M6, if I delete a project that has read-only files in it, it will prompt if I want to delete the files even if I select "Do not delete contents". The files are not actually deleted, but the error dialog should not be presented to the user since the files are not actually being deleted. I don't remember seeing this in 3.3M4 or earlier.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/undo/AbstractResourcesOperation.java
* @param descriptions
	 *            the array of resource descriptions
	 */
	protected void setResourceDescriptions(ResourceDescription[] descriptions) {
		if (descriptions == null) {
			resourceDescriptions = new ResourceDescription[0];
		} else {
			resourceDescriptions = descriptions;
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.ide.undo.AbstractWorkspaceOperation#appendDescriptiveText(java.lang.StringBuffer)
	 */
	protected void appendDescriptiveText(StringBuffer text) {
		super.appendDescriptiveText(text);
		text.append(" resourceDescriptions: "); 
		text.append(resourceDescriptions);
		text.append('\'');
	}
	/**
	 * Compute a scheduling rule for creating resources.
	 * 
	 * @return a scheduling rule appropriate for creating the resources
	 *         specified in the resource descriptions
	 */
	protected ISchedulingRule computeCreateSchedulingRule() {
		ISchedulingRule[] ruleArray = new ISchedulingRule[resourceDescriptions.length * 3];
		for (int i = 0; i < resourceDescriptions.length; i++) {