recycler: improve fast-scroller truncation

Make fast-scroller truncation more aggressive, mostly because on my new
ROM it seems like display calculations become a little wonky and cause
slight indicator cutoff. May as well add padding then so that
indicators [and the thumb by extension] actually fit and won't get
clipped.

app/src/main/java/org/oxycblt/auxio/music/MusicUtils.kt

@@ -63,7 +63,7 @@ fun String.getGenreNameCompat(): String? {
     }
 
     if (startsWith('(') && endsWith(')')) {
-        // ID3 v2+, parse out the parentheses and get the integer
+        // ID3v2.3/ID3v2.4, parse out the parentheses and get the integer
         // Any genres formatted as "(CHARS)" will be ignored.
         val genreInt = substring(1 until lastIndex).toIntOrNull()
 

app/src/main/java/org/oxycblt/auxio/recycler/FastScrollView.kt

@@ -157,10 +157,13 @@ class FastScrollView @JvmOverloads constructor(
         )
 
         // If the scroller size is too small to contain all the entries, truncate entries
-        // so that the fast scroller entries fit.
+        // so that the fast scroller entries fit. Include the thumb in here so it isn't cut
-        val maxEntries = height / textHeight
+        // off.
+        val maxEntries = (height - (binding.scrollThumb.height * 2)) / textHeight
 
-        if (indicators.size > maxEntries.toInt()) {
+        logD("${ceil(indicators.size / maxEntries).toInt()}")
+
+        if (indicators.size > maxEntries) {
             val truncateInterval = ceil(indicators.size / maxEntries).toInt()
 
             check(truncateInterval > 1) {

info/FORMATS.md

@@ -10,7 +10,7 @@ Here are the music formats that Auxio supports, as per the [Supported ExoPlayer
 
 | Format | Supported | Comments |
 |--------|-----------|-----------
-| M4A    | ✅ | |
+| MP4    | ✅ | |
 | MP3    | ✅ | |
 | MKA    | ✅ | |
 | OGG    | ✅ | Containing Vorbis, Opus, and FLAC |