Handle toolbar title in manga details on tablets similar to on phones

(cherry picked from commit 47f865aa720c47faa7853f4be3065e3ba718f1ba)

# Conflicts:
#	app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt

@@ -353,6 +353,15 @@ class MangaController :
                     mangaInfoButtonsAdapter
                 )
             )
+
+            it.scrollEvents()
+                .onEach { updateToolbarTitleAlpha() }
+                .launchIn(viewScope)
+
+            // Delayed in case we need to jump to chapters
+            it.post {
+                updateToolbarTitleAlpha()
+            }
         }
         binding.chaptersRecycler?.let {
             it.adapter = ConcatAdapter(chaptersHeaderAdapter, chaptersAdapter)
@@ -392,19 +401,17 @@ class MangaController :
     }
 
     private fun updateToolbarTitleAlpha(alpha: Int? = null) {
-        if (binding.fullRecycler == null) {
-            return
-        }
+        val scrolledList = binding.fullRecycler ?: binding.infoRecycler!!
 
         val calculatedAlpha = when {
             // Specific alpha provided
             alpha != null -> alpha
 
             // First item isn't in view, full opacity
-            ((binding.fullRecycler!!.layoutManager as LinearLayoutManager).findFirstVisibleItemPosition() > 0) -> 255
+            ((scrolledList.layoutManager as LinearLayoutManager).findFirstVisibleItemPosition() > 0) -> 255
 
             // Based on scroll amount when first item is in view
-            else -> min(binding.fullRecycler!!.computeVerticalScrollOffset(), 255)
+            else -> min(scrolledList.computeVerticalScrollOffset(), 255)
         }
 
         (activity as? MainActivity)?.binding?.toolbar?.setTitleTextColor(

app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoHeaderAdapter.kt

@@ -224,16 +224,10 @@ class MangaInfoHeaderAdapter(
          */
         private fun setMangaInfo(manga: Manga, source: Source?) {
             // Update full title TextView.
-            with(binding.mangaFullTitle) {
-                if (isTablet) {
-                    isVisible = false
-                } else {
-                    text = if (manga.title.isBlank()) {
-                        view.context.getString(R.string.unknown)
-                    } else {
-                        manga.title
-                    }
-                }
+            binding.mangaFullTitle.text = if (manga.title.isBlank()) {
+                view.context.getString(R.string.unknown)
+            } else {
+                manga.title
             }
 
             // Update author TextView.