list: avoid crashing on span size lookups

Apparently sometimes the span size lookup will try to find an item that
does not exist. Fix that.

app/src/main/java/org/oxycblt/auxio/MainActivity.kt

@@ -51,7 +51,7 @@ import org.oxycblt.auxio.util.systemBarInsetsCompat
  * TODO: Fix UID naming
  * TODO: Leverage FlexibleListAdapter more in dialogs (Disable item anims)
  * TODO: Add more logging
- * TODO: Try to move on from shared objs in synchronized and volatile
+ * TODO: Try to move on from synchronized and volatile in shared objs
  */
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity() {

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

@@ -101,7 +101,10 @@ class ArtistDetailFragment :
             adapter = ConcatAdapter(artistHeaderAdapter, artistListAdapter)
             (layoutManager as GridLayoutManager).setFullWidthLookup {
                 if (it != 0) {
-                    val item = detailModel.artistList.value[it - 1]
+                    val item =
+                        detailModel.artistList.value.getOrElse(it - 1) {
+                            return@setFullWidthLookup false
+                        }
                     item is Divider || item is Header
                 } else {
                     true

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

@@ -94,7 +94,10 @@ class GenreDetailFragment :
             adapter = ConcatAdapter(genreHeaderAdapter, genreListAdapter)
             (layoutManager as GridLayoutManager).setFullWidthLookup {
                 if (it != 0) {
-                    val item = detailModel.genreList.value[it - 1]
+                    val item =
+                        detailModel.genreList.value.getOrElse(it - 1) {
+                            return@setFullWidthLookup false
+                        }
                     item is Divider || item is Header
                 } else {
                     true

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

@@ -109,7 +109,10 @@ class PlaylistDetailFragment :
                 }
             (layoutManager as GridLayoutManager).setFullWidthLookup {
                 if (it != 0) {
-                    val item = detailModel.playlistList.value[it - 1]
+                    val item =
+                        detailModel.playlistList.value.getOrElse(it - 1) {
+                            return@setFullWidthLookup false
+                        }
                     item is Divider || item is Header
                 } else {
                     true

app/src/main/java/org/oxycblt/auxio/search/SearchFragment.kt

@@ -110,7 +110,10 @@ class SearchFragment : ListFragment<Music, FragmentSearchBinding>() {
         binding.searchRecycler.apply {
             adapter = searchAdapter
             (layoutManager as GridLayoutManager).setFullWidthLookup {
-                val item = searchModel.searchResults.value[it]
+                val item =
+                    searchModel.searchResults.value.getOrElse(it) {
+                        return@setFullWidthLookup false
+                    }
                 item is Divider || item is Header
             }
         }

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

@@ -335,6 +335,7 @@
     <string name="def_track">No track</string>
     <string name="def_song_count">No songs</string>
     <string name="def_playback">No music playing</string>
+    <string name="def_playlists">There\'s nothing here yet</string>
 
     <!-- Codec Namespace | Format names -->
     <eat-comment />