Dialog for file type selection does not alow different compression settings

[K Dietrich]

I tried to enter more than one setting for mp3 encoding with lame (screenshot k3b_encoder_settings)
Entering the settings is no problem, but the dialog to select a filetype messes up, when there are several entries for one file extension, eg. mp3 (screenshot kde_file_type_selection). The dialog shows three times the last entry.

Oh and by the way, the dialog for the selection of the file type does not get a refresh after changes of the settings.