Gpgtools MacGPG2

Reproduce

1. Install gpg tools
   
2. Open gpg keychain.
   
3. Create two keys (say key 1 and key 2).
   
4. Open terminal (or any other app where you can easily create a file).
   
5. Create file
   

   echo 123 > testfile.txt
   

6. Open testfile.txt directory in finder.
   
7. Open context menu for the file.
   
8. Services -> OpenPGP: Sign File
   
9. Choose key 1 and sign the file with detached signature (say signature 1).
   
10. In finder open context menu for testfile.txt.sig.
    
11. Services -> OpenPGP: Sign File
    
12. Choose key 2 and sign the file with detached signature (say signature 2).
    
13. Edit testfile.txt, e.g. from terminal
    

    echo 000 > testfile.txt
    

14. In finder double click on signature 2 - it shows good signature (key 2) and that signed file is textfile.txt.sig.
    
15. In finder double click on signature 1 - it shows good signature (key 2) and that signed file is textfile.txt.sig itself.

What did you expect instead

On step 15:
1. The app shows wrong information about signature. It must show key 1 as key which signed testfile.txt.
2. The app shows wrong file that was signed. It must bet testfile.txt not testfile.txt.sig.
3. The app shows wrong information about file verification. It must state that signature is bad, cause file has changed after signing

Terminal using gpg/gpg2 utility the correct verification results are shown.