Pushing up or down will move the selected-index one step.
This will add a similar pageup/pagedown feature to the search window.

It should be possible to redefine shortcut-keys on each system. Customization should be part of the GUI and take effect once it is changed.

• The next track should be displayed in the popup window, similar to how the queue is displayed.
• The next track should only be displayed if the queue is empty.

Note that the implementation of this depends on deaddog/DeadDog.Audio#7.

When Windows is shut down and auto-closes the player, the settings file is not correctly stored.
The next time the application is started an exception is thrown when attempting to load the empty file.

When opening the search window, typing a query and pushing the down key the selected element is the lastly selected one (if it is still part of the query).
Instead, searching should reset such that no element is selected before pressing down.

Settings files should be automatically backed up and the latest backup loaded on format errors in the most recent settings file.

It should be possible to add/remove media sources while the program is running.