Wrap FileChooser's shortcuts panel in vertical scroll pane

[mbien]

Hello,

The shortcuts panel (FlatFileChooserUI.FlatShortcutsPanel) will currently define the height of the JFileChooser if it contains many shortcuts - so it can become quite tall.

Would it make sense for FlatLaf to wrap it in a JScrollPane for vertical scrolling? Could look like this:

a few more screenshots here: https://github.com/apache/netbeans/pull/7164