#5 Message definition's file path display format.
Current operation (correct part): When the user highlights a message definition file from the loaded files list, the path is changed to a short version with QString::seperate. The selected file path stays short when the user selects it.
Current operation (bug part): After selecting, if the user opens the list again and highlights another definition (or just the title item "Select"), the current item's short path changes to long version. This is normal operation, but if the user now does not select another definition and clicks outside the drop down list, the message file path is shown as a long, full version, not the short one it should be.
In short: Message definition file path should be shown as short version when it is chosen, but when hovering over another item, and without selecting an item the drop down list loses focus, the file path is shown in long format.
Long format: /x/y/z/file.xml
Short format: z/file.xml
