fixed issue where when requesting playlist deletion mode, the trash button was hidden

src/meson.build

@@ -21,6 +21,7 @@ song_deps = [
   dependency('json-glib-1.0'),
   dependency('gstreamer-1.0'),
   dependency('gee-0.8'),
+  dependency('libpanel-1'),
 ]
 
 song_sources += gnome.compile_resources('song-resources',

src/widgets/playlist.vala

@@ -1,7 +1,6 @@
 namespace Song {
     public class PlaylistButton : Gtk.Box {
 
-        private Settings settings = new Settings ("com.liyaowhen.Song");
         
         public PlaylistObject playlist;
         private Gtk.Button remove_button;
@@ -14,7 +13,6 @@ namespace Song {
 
         construct {
 
-
             orientation = Gtk.Orientation.HORIZONTAL;
             add_css_class("toolbar");
             remove_button = new Gtk.Button.from_icon_name("app-remove-symbolic");
@@ -34,6 +32,7 @@ namespace Song {
             main_button.hexpand = true;
             append(main_button);
             append(remove_button_revealer);
+            main_button.can_shrink = true;
 
             hexpand = true;
 

src/widgets/side_bar.vala

@@ -19,6 +19,7 @@ namespace Song {
             var toolbar_view = new Adw.ToolbarView();
 
             var scroll_box = new Gtk.ScrolledWindow();
+            scroll_box.hscrollbar_policy = Gtk.PolicyType.NEVER;
             side_bar_content = new SideBarContent ();
             side_bar_content.set_vexpand (true);
             side_bar_content.set_hexpand (true);