Fix broken playlist undostack when i.e. removing duplicates and unavailable songs

src/core/mainwindow.cpp

@@ -2026,7 +2026,7 @@ void MainWindow::ShowInCollection() {
 }
 
 void MainWindow::PlaylistRemoveCurrent() {
-  ui_->playlist->view()->RemoveSelected(false);
+  ui_->playlist->view()->RemoveSelected();
 }
 
 void MainWindow::PlaylistClearCurrent() {

src/playlist/playlist.cpp

@@ -930,7 +930,8 @@ void Playlist::InsertItems(const PlaylistItemList &itemsIn, int pos, bool play_n
     // Too big to keep in the undo stack. Also clear the stack because it might have been invalidated.
     InsertItemsWithoutUndo(items, pos, enqueue, enqueue_next);
     undo_stack_->clear();
-  } else {
+  }
+  else {
     undo_stack_->push(new PlaylistUndoCommands::InsertItems(this, items, pos, enqueue, enqueue_next));
   }
 
@@ -1384,6 +1385,8 @@ void Playlist::RemoveItemsWithoutUndo(const QList<int> &indicesIn) {
 
 bool Playlist::removeRows(int row, int count, const QModelIndex &parent) {
 
+  Q_UNUSED(parent);
+
   if (row < 0 || row >= items_.size() || row + count > items_.size()) {
     return false;
   }
@@ -1393,9 +1396,6 @@ bool Playlist::removeRows(int row, int count, const QModelIndex &parent) {
     RemoveItemsWithoutUndo(row, count);
     undo_stack_->clear();
   }
-  else if (parent == QModelIndex()) {
-    RemoveItemsWithoutUndo(row, count);
-  }
   else {
     undo_stack_->push(new PlaylistUndoCommands::RemoveItems(this, row, count));
   }

src/playlist/playlistview.cpp

@@ -543,12 +543,12 @@ void PlaylistView::keyPressEvent(QKeyEvent *event) {
     QTreeView::keyPressEvent(event);
   }
   else if (event == QKeySequence::Delete) {
-    RemoveSelected(false);
+    RemoveSelected();
     event->accept();
 #ifdef Q_OS_MACOS
   }
   else if (event->key() == Qt::Key_Backspace) {
-    RemoveSelected(false);
+    RemoveSelected();
     event->accept();
 #endif
   }
@@ -586,7 +586,7 @@ void PlaylistView::contextMenuEvent(QContextMenuEvent *e) {
   e->accept();
 }
 
-void PlaylistView::RemoveSelected(bool deleting_from_disk) {
+void PlaylistView::RemoveSelected() {
 
   int rows_removed = 0;
   QItemSelection selection(selectionModel()->selection());
@@ -603,13 +603,7 @@ void PlaylistView::RemoveSelected(bool deleting_from_disk) {
 
   for (const QItemSelectionRange &range : selection) {
     if (range.top() < last_row) rows_removed += range.height();
-
-    if (!deleting_from_disk) {
-      model()->removeRows(range.top(), range.height(), range.topLeft());
-    }
-    else {
-      model()->removeRows(range.top(), range.height(), QModelIndex());
-    }
+    model()->removeRows(range.top(), range.height(), range.parent());
   }
 
   int new_row = last_row - rows_removed;

src/playlist/playlistview.h

@@ -101,7 +101,7 @@ class PlaylistView : public QTreeView {
   void SetApplication(Application *app);
   void SetItemDelegates(CollectionBackend *backend);
   void SetPlaylist(Playlist *playlist);
-  void RemoveSelected(bool deleting_from_disk);
+  void RemoveSelected();
 
   void SetReadOnlySettings(bool read_only) { read_only_settings_ = read_only; }