Just to save some other folk from wasting his time with this:
In my app delegate I've tried to implement the
panel:panelSelectionDidChange callback in order to customize our
accessory view depending on the current user selection in the browser.
Using the stripped down version below for investigating and following
what NSLog outputs to the console I found out that my method is not
called at all, when the user clicks any of the items under Devices or
Places on the sidebar. It is called for items under the Media
category, but all directory, filename and URL strings are null.
Delegate method panel:shouldShowFilename is called for the clicked
item, so for our application we are going to cache the last selected
item, and watch for changes ourselves (unless of course someone has a
better solution to propose).
