Bug 312661

If you try to change Metadata of an image with insufficient file write permissions, the operation fails. But the user is not informed about this failure.

Reproducible: Always

Steps to Reproduce:
1. configure digikam to write tag in jpg files
2. take picture (jpg file) in digikam and assign a tag to it 
  => tag is written to IPTC information in the file
3. in Konsole: chmod a-w myPicture.jpg
4. in digiKam: select the picture and go to Image -> Metadata -> Edit All Metadata...
5. select Edit IPTC tab
6. select your tag (assigned above)
7. click "Delete"
8. press "OK" 
Actual Results:  
No error message is shown and the user thinks the changes are applied.
But "exiv2 -p a myPicture.jpg" in Konsole reveals, that the "Iptc.Application2.Keywords" (= tag) is still in the file.
Also the "Edit All Metadata..." dialog mentioned above, shows that the keyword/tag is still there.

Expected Results:  
An error message should be shown, like e.g.: "Could not update file metadata due to insufficient file permissions" 

As workaround (until this is fixed), the user could click "Apply" instead of "OK".
After clicking "Apply", the metadata seems to be reloaded from the file after the metadata change attempt. So the user sees the deleted tag to appear again. (Not nice, but better than no feedback)

I use KDE 4.9.3 and digiKam 2.9.0.