music: extend non-standard artists to id3v2

Just pre-emptively add support for TXXX variations of the non-standard
vorbis artist fields to the ID3v2 parser.

I'd imagine the naming convention will be similar between them, so why
not.

app/src/main/java/org/oxycblt/auxio/detail/ReadOnlyTextInput.kt

@@ -30,7 +30,7 @@ import org.oxycblt.auxio.R
  *
  * Adapted from Material Files: https://github.com/zhanghai/MaterialFiles
  *
- * @author Alexander Capehart (OxygenCobalt)
+ * @author Hai Zhang, Alexander Capehart (OxygenCobalt)
  */
 class ReadOnlyTextInput
 @JvmOverloads

app/src/main/java/org/oxycblt/auxio/music/extractor/MetadataExtractor.kt

@@ -213,12 +213,12 @@ class Task(context: Context, private val raw: Song.Raw) {
         // Artist
         textFrames["TXXX:musicbrainz artist id"]?.let { raw.artistMusicBrainzIds = it }
         (textFrames["TXXX:artists"] ?: textFrames["TPE1"])?.let { raw.artistNames = it }
-        textFrames["TSOP"]?.let { raw.artistSortNames = it }
+        (textFrames["TXXX:artists_sort"] ?: textFrames["TSOP"])?.let { raw.artistSortNames = it }
 
         // Album artist
         textFrames["TXXX:musicbrainz album artist id"]?.let { raw.albumArtistMusicBrainzIds = it }
-        textFrames["TPE2"]?.let { raw.albumArtistNames = it }
+        (textFrames["TXXX:albumartists"] ?: textFrames["TPE2"])?.let { raw.albumArtistNames = it }
-        textFrames["TSO2"]?.let { raw.albumArtistSortNames = it }
+        (textFrames["TXXX:albumartists_sort"] ?: textFrames["TSO2"])?.let { raw.albumArtistSortNames = it }
 
         // Genre
         textFrames["TCON"]?.let { raw.genreNames = it }

app/src/main/java/org/oxycblt/auxio/playback/queue/QueueAdapter.kt

@@ -167,6 +167,7 @@ class QueueSongViewHolder private constructor(private val binding: ItemQueueSong
         fun from(parent: View) =
             QueueSongViewHolder(ItemQueueSongBinding.inflate(parent.context.inflater))
 
+        // TODO: This is not good enough, I need to compare item indices as well.
         /** A comparator that can be used with DiffUtil. */
         val DIFF_CALLBACK = SongViewHolder.DIFF_CALLBACK
     }

app/src/main/res/layout/dialog_music_dirs.xml

@@ -12,6 +12,18 @@
         android:layout_height="match_parent"
         android:orientation="vertical">
 
+        <TextView
+            style="@style/Widget.Auxio.TextView.Header"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingStart="@dimen/spacing_large"
+            android:paddingEnd="@dimen/spacing_large"
+            android:text="@string/set_dirs_list" />
+
+        <com.google.android.material.divider.MaterialDivider
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+
         <androidx.recyclerview.widget.RecyclerView
             android:id="@+id/dirs_recycler"
             style="@style/Widget.Auxio.RecyclerView.Linear"

app/src/main/res/values/strings.xml

@@ -231,6 +231,7 @@
     <string name="set_observing_desc">Reload the music library whenever it changes (requires persistent notification)</string>
     <string name="set_dirs">Music folders</string>
     <string name="set_dirs_desc">Manage where music should be loaded from</string>
+    <string name="set_dirs_list">Folders</string>
     <!-- As in the mode to be used with the music folders setting -->
     <string name="set_dirs_mode">Mode</string>
     <!-- Exclude folders from music loading -->