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
markInvalid();
			return getErrorStatus(UndoMessages.AbstractResourcesOperation_NotEnoughInfo);
		}
		if (!resourcesExist()) {
			markInvalid();
			return getErrorStatus(UndoMessages.AbstractResourcesOperation_ResourcesDoNotExist);
		}
		
		
		if (!quietCompute) {
			ReadOnlyStateChecker checker = new ReadOnlyStateChecker(
					getShell(null),
					IDEWorkbenchMessages.DeleteResourceAction_title1,
					IDEWorkbenchMessages.DeleteResourceAction_readOnlyQuestion);
			checker.setIgnoreLinkedResources(true);
			IResource[] approvedResources = checker
					.checkReadOnlyResources(resources);
			if (approvedResources.length == 0) {
				
				return Status.CANCEL_STATUS;
			}
			
			setTargetResources(approvedResources);
		}
		return Status.OK_STATUS;
	}
	/**
	 * Set the array of resource descriptions describing resources to be
	 * restored when undoing or redoing this operation.
	 *