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/extensions/org/eclipse/ui/actions/DeleteResourceAction.java
if (containsOnlyProjects(resources)) {
			return confirmDeleteProjects(resources);
		}
		return confirmDeleteNonProjects(resources);
		
	}
	/**
	 * Asks the user to confirm a delete operation, where the selection contains
	 * no projects.
	 * 
	 * @param resources
	 *            the selected resources
	 * @return <code>true</code> if the user says to go ahead, and
	 *         <code>false</code> if the deletion should be abandoned
	 */
	private boolean confirmDeleteNonProjects(IResource[] resources) {
		String title;
		String msg;
		if (resources.length == 1) {
			title = IDEWorkbenchMessages.DeleteResourceAction_title1;
			IResource resource = resources[0];
			if (resource.isLinked()) {
				msg = NLS
						.bind(
								IDEWorkbenchMessages.DeleteResourceAction_confirmLinkedResource1,
								resource.getName());
			} else {
				msg = NLS.bind(
						IDEWorkbenchMessages.DeleteResourceAction_confirm1,
						resource.getName());