Allow playing of tracks already in queue

src/playlist/queue.cpp

@@ -152,6 +152,17 @@ void Queue::ToggleTracks(const QModelIndexList& source_indexes) {
 }
 
 void Queue::InsertFirst(const QModelIndexList& source_indexes) {
+    for (const QModelIndex& source_index : source_indexes) {
+        QModelIndex proxy_index = mapFromSource(source_index);
+        if (proxy_index.isValid()) {
+            // Already in the queue, so remove it to be reinserted later
+            const int row = proxy_index.row();
+            beginRemoveRows(QModelIndex(), row, row);
+            source_indexes_.removeAt(row);
+            endRemoveRows();
+        }
+    }
+
     const int rows = source_indexes.count();
     // Enqueue the tracks at the beginning
     beginInsertRows(QModelIndex(), 0, rows - 1);

src/ui/mainwindow.cpp

@@ -1763,10 +1763,10 @@ void MainWindow::PlaylistRightClick(const QPoint& global_pos,
   else
     playlist_queue_->setText(tr("Toggle queue status"));
 
-  if (in_queue == 0 && not_in_queue == 1)
-      playlist_queue_play_next_->setText(tr("Play next"));
-  else if (in_queue == 0 && not_in_queue > 1)
+   if (all > 1)
       playlist_queue_play_next_->setText(tr("Play selected tracks next"));
+   else
+      playlist_queue_play_next_->setText(tr("Play next"));
 
   if (in_skipped == 1 && not_in_skipped == 0)
     playlist_skip_->setText(tr("Unskip track"));