Persists selected music library folder when changed through the GUI (#469)

* Resolves #453 and #295 by changing and saving the music folder location

Author: ZavierHenry

src/Dialogs/PreferencesWindow.vala

@@ -49,7 +49,8 @@ public class Noise.PreferencesWindow : Gtk.Dialog {
         library_filechooser.hexpand = true;
         library_filechooser.set_current_folder (Settings.Main.get_default ().music_folder);
         library_filechooser.file_set.connect (() => {
-            App.main_window.setMusicFolder (library_filechooser.get_current_folder ());
+            string? filename = library_filechooser.get_uri ().replace ("file://", "");
+            App.main_window.setMusicFolder (filename);
         });
 
         var main_settings = Settings.Main.get_default ();

src/LocalBackend/LocalLibrary.vala

@@ -186,6 +186,9 @@ public class Noise.LocalLibrary : Library {
         m_folder = m_folder.replace (GLib.Environment.get_home_dir ()+ "/", "");
 
         if (start_file_operations (_("Importing music from %s…").printf ("<b>" + Markup.escape_text (m_folder) + "</b>"))) {
+
+            Settings.Main.get_default ().music_folder = folder;
+
             remove_all_static_playlists ();
 
             clear_medias ();