The file details panel is not initialised or updated when it is opened.

1. Hide the file details panel.
2. Restart QDirStat.
3. Select a file.
4. Show the details panel.
   The panel is blank. Not too horrible, but a symptom of the problem.

For a worse case:

1. With the details panel visible, select a file.
2. Hide the panel
3. Select a different file.
4. Show the panel.
   The panel still shows the details of the first file, not those of the currently-selected file.