Description of problem:
file-roller will not update (overwrite) destination files when unpacking (at
least) a subset of an archive.

Version-Release number of selected component (if applicable):
file-roller-2.20.3-1.fc8
file-roller-2.22.4-1.fc9.i386

How reproducible:
Always.

Steps to Reproduce:
1. Create two archives containing some subfolders and files. arch-1.tar.bz2 and
arch-2.tar.bz2 attached are like this --- they contain

   arch-{12}/folder/file

respectively, where file contains the string "Version 1" or "Version 2".

2. Create a destination folder, e.g. "dest".
3. Open arch-1.tar.bz2 in file-roller. Navtigate into "arch-1", select "folder",
and extract it to "dest", with "Re-create folders" and "Overwrite existing" checked.
4. Check dest/folder/file reads "Version 1".
5. Repeat step 3 with arch-2.tar.bz2.
6. Check dest/folder/file. It still reads "Version 1", we'd expect "Version 2".
  
Actual results:
Files not updated.

Expected results:
Files updated.