fix: alternative track source not playing new source

lib/components/root/bottom_player.dart

@@ -1,6 +1,5 @@
 import 'dart:ui';
 
-import 'package:flutter/gestures.dart';
 import 'package:flutter_desktop_tools/flutter_desktop_tools.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:go_router/go_router.dart';
@@ -18,9 +17,9 @@ import 'package:spotube/extensions/context.dart';
 import 'package:spotube/hooks/use_brightness_value.dart';
 import 'package:spotube/models/logger.dart';
 import 'package:flutter/material.dart';
+import 'package:spotube/provider/authentication_provider.dart';
 import 'package:spotube/provider/proxy_playlist/proxy_playlist_provider.dart';
 import 'package:spotube/provider/user_preferences_provider.dart';
-import 'package:spotube/provider/volume_provider.dart';
 import 'package:spotube/utils/platform.dart';
 import 'package:spotube/utils/type_conversion_utils.dart';
 
@@ -30,6 +29,7 @@ class BottomPlayer extends HookConsumerWidget {
   final logger = getLogger(BottomPlayer);
   @override
   Widget build(BuildContext context, ref) {
+    final auth = ref.watch(AuthenticationNotifier.provider);
     final playlist = ref.watch(ProxyPlaylistNotifier.provider);
     final layoutMode =
         ref.watch(userPreferencesProvider.select((s) => s.layoutMode));
@@ -87,6 +87,7 @@ class BottomPlayer extends HookConsumerWidget {
                   children: [
                     PlayerActions(
                       extraActions: [
+                        if (auth != null)
                           IconButton(
                             tooltip: context.l10n.mini_player,
                             icon: const Icon(SpotubeIcons.miniPlayer),

lib/provider/proxy_playlist/proxy_playlist_provider.dart

@@ -19,19 +19,19 @@ import 'package:spotube/provider/piped_provider.dart';
 import 'package:spotube/utils/persisted_state_notifier.dart';
 import 'package:spotube/utils/type_conversion_utils.dart';
 
-/// Things to implement:
+/// Things implemented:
 /// * [x] Sponsor-Block skip
 /// * [x] Prefetch next track as [SpotubeTrack] on 80% of current track
 /// * [x] Mixed Queue containing both [SpotubeTrack] and [LocalTrack]
-/// * [ ] Modification of the Queue
+/// * [x] Modification of the Queue
 ///       * [x] Add track at the end
 ///       * [x] Add track at the beginning
 ///       * [x] Remove track
-///       * [ ] Reorder track
+///       * [x] Reorder track
 /// * [x] Caching and loading of cache of tracks
 /// * [x] Shuffling
 /// * [x] loop => playlist, track, none
-/// * [ ] Alternative Track Source
+/// * [x] Alternative Track Source
 /// * [x] Blacklisting of tracks and artist
 ///
 /// Don'ts:

lib/services/audio_player/mk_state_player.dart

@@ -216,20 +216,32 @@ class MkPlayerWithState extends Player {
 
   /// This replaces the old source with a new one
   ///
+  /// If the old source is playing, the new one will play
+  /// from the beginning
+  ///
   /// This doesn't work when [playlist] is null
-  /// Or, when the current media is the one to be replaced
   void replace(String oldUrl, String newUrl) {
-    if (_playlist == null ||
-        _playlist!.medias[_playlist!.index].uri == oldUrl) {
+    if (_playlist == null) {
       return;
     }
 
+    final isOldUrlPlaying = _playlist!.medias[_playlist!.index].uri == oldUrl;
+
     for (var i = 0; i < _playlist!.medias.length - 1; i++) {
       final media = _playlist!.medias[i];
       if (media.uri == oldUrl) {
+        if (isOldUrlPlaying) {
+          pause();
+        }
         final newMedias = _playlist!.medias.toList();
         newMedias[i] = Media(newUrl, extras: media.extras);
         playlist = _playlist!.copyWith(medias: newMedias);
+        if (isOldUrlPlaying) {
+          super.open(
+            newMedias[i],
+            play: true,
+          );
+        }
         break;
       }
     }