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/DeleteResourcesOperation.java
private boolean deleteContent = false;
	/**
	 * Create a DeleteResourcesOperation
	 * 
	 * @param resources
	 *            the resources to be deleted
	 * @param label
	 *            the label of the operation
	 * @param deleteContent
	 *            whether or not we are deleting content for projects
	 */
	public DeleteResourcesOperation(IResource[] resources, String label,
			boolean deleteContent) {
		super(resources, label);
		this.deleteContent = deleteContent;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * Map execution to resource deletion.