-Fixed memory leak on rogue observable in history fragment.

-Removed stream id from playlist stream join table since only foreign constraint is needed.
-Added bar to playlist control UI.
-Modified local playlist fragment to no longer save when out of focus.

app/src/main/java/org/schabi/newpipe/database/Migrations.java

@@ -28,7 +28,7 @@ public class Migrations {
             database.execSQL("CREATE TABLE IF NOT EXISTS `stream_state` (`stream_id` INTEGER NOT NULL, `progress_time` INTEGER NOT NULL, PRIMARY KEY(`stream_id`), FOREIGN KEY(`stream_id`) REFERENCES `streams`(`uid`) ON UPDATE CASCADE ON DELETE CASCADE )");
             database.execSQL("CREATE TABLE IF NOT EXISTS `playlists` (`uid` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `name` TEXT, `thumbnail_url` TEXT)");
             database.execSQL("CREATE  INDEX `index_playlists_name` ON `playlists` (`name`)");
-            database.execSQL("CREATE TABLE IF NOT EXISTS `playlist_stream_join` (`playlist_id` INTEGER NOT NULL, `stream_id` INTEGER NOT NULL, `join_index` INTEGER NOT NULL, PRIMARY KEY(`playlist_id`, `stream_id`, `join_index`), FOREIGN KEY(`playlist_id`) REFERENCES `playlists`(`uid`) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED, FOREIGN KEY(`stream_id`) REFERENCES `streams`(`uid`) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED)");
+            database.execSQL("CREATE TABLE IF NOT EXISTS `playlist_stream_join` (`playlist_id` INTEGER NOT NULL, `stream_id` INTEGER NOT NULL, `join_index` INTEGER NOT NULL, PRIMARY KEY(`playlist_id`, `join_index`), FOREIGN KEY(`playlist_id`) REFERENCES `playlists`(`uid`) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED, FOREIGN KEY(`stream_id`) REFERENCES `streams`(`uid`) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED)");
             database.execSQL("CREATE UNIQUE INDEX `index_playlist_stream_join_playlist_id_join_index` ON `playlist_stream_join` (`playlist_id`, `join_index`)");
             database.execSQL("CREATE  INDEX `index_playlist_stream_join_stream_id` ON `playlist_stream_join` (`stream_id`)");
 

app/src/main/java/org/schabi/newpipe/database/playlist/model/PlaylistStreamEntity.java

@@ -14,7 +14,7 @@ import static org.schabi.newpipe.database.playlist.model.PlaylistStreamEntity.JO
 import static org.schabi.newpipe.database.playlist.model.PlaylistStreamEntity.PLAYLIST_STREAM_JOIN_TABLE;
 
 @Entity(tableName = PLAYLIST_STREAM_JOIN_TABLE,
-        primaryKeys = {JOIN_PLAYLIST_ID, JOIN_STREAM_ID, JOIN_INDEX},
+        primaryKeys = {JOIN_PLAYLIST_ID, JOIN_INDEX},
         indices = {
                 @Index(value = {JOIN_PLAYLIST_ID, JOIN_INDEX}, unique = true),
                 @Index(value = {JOIN_STREAM_ID})

app/src/main/java/org/schabi/newpipe/fragments/local/LocalPlaylistFragment.java

@@ -469,7 +469,6 @@ public class LocalPlaylistFragment extends BaseLocalListFragment<List<PlaylistSt
         return debouncedSaveSignal
                 .debounce(SAVE_DEBOUNCE_MILLIS, TimeUnit.MILLISECONDS)
                 .observeOn(AndroidSchedulers.mainThread())
-                .doOnDispose(this::saveJoin)
                 .subscribe(ignored -> saveJoin());
     }
 

app/src/main/java/org/schabi/newpipe/history/HistoryFragment.java

@@ -222,11 +222,16 @@ public abstract class HistoryFragment<E> extends BaseFragment
     @Override
     public void onDestroy() {
         super.onDestroy();
+
+        if (disposables != null) disposables.dispose();
+        if (historySubscription != null) historySubscription.cancel();
+
         mSharedPreferences.unregisterOnSharedPreferenceChangeListener(mHistoryIsEnabledChangeListener);
         mSharedPreferences = null;
         mHistoryIsEnabledChangeListener = null;
         mHistoryIsEnabledKey = null;
-        if (disposables != null) disposables.dispose();
+        historySubscription = null;
+        disposables = null;
     }
 
     @Override

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

@@ -1,10 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout android:layout_width="match_parent"
-    android:layout_height="@dimen/playlist_ctrl_height"
+
+<RelativeLayout
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/playlist_control"
     xmlns:android="http://schemas.android.com/apk/res/android"
-    android:visibility="invisible">
+    android:visibility="invisible"
+    tools:visibility="visible">
 
+    <LinearLayout
+        android:id="@+id/playlist_panel"
+        android:layout_width="match_parent"
+        android:layout_height="@dimen/playlist_ctrl_height">
         <LinearLayout
             android:id="@+id/playlist_ctrl_play_bg_button"
             android:layout_width="match_parent"
@@ -81,3 +89,12 @@
                 android:drawableStart="?attr/popup"/>
         </LinearLayout>
     </LinearLayout>
+
+    <View
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:layout_below="@+id/playlist_panel"
+        android:layout_marginLeft="8dp"
+        android:layout_marginRight="8dp"
+        android:background="?attr/separator_color"/>
+</RelativeLayout>

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

@@ -6,7 +6,8 @@
     android:layout_height="wrap_content"
     android:layout_marginBottom="12dp"
     android:background="?attr/selectableItemBackground"
-    android:clickable="true">
+    android:clickable="true"
+    android:focusable="true">
 
     <ImageView
         android:id="@+id/whatsNewIcon"