Cipher selection control isn't scrollable
The cipher selection control isn't scrollable when running in libadwaita mode inside GNOME Settings, people may argue that this is a libadwaita bug because when using nm-connection-editor the standard GTK4 control displays the scrollable buttons.
But on the other hand, the list is to large to be presented on a GTK combo, even the standard one, the scrolling method is poorly implemented in contrast with a Windows combo box that uses a standard scrollbar.
The ideal solution is to have another kind of UI, probably an autocompletion one.