Please describe the problem:
Orginally reported at the Ubuntu bug tracker: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/152879

Nautilus deletes files without warning even when they have been marked read-only (444) or don't read (000). You have to be the owner of the file to do this. The behavior when using 'rm' on the console is a warning that the file is write protected. This should be implemented in Nautilus since at the moment no effective protection against accidental removal of files is possible.

Steps to reproduce:
1. Create a new file
2. Change its permissions to read-only for you, group and others
3. Trash and delete it with Nautilus



Actual results:
There comes no warning or error message at all.

Expected results:
A warning "Are you sure you want to delete this read-only file?".

Does this happen every time?
Yes

Other information: