If there's only one node in a library item then expand it when expanding the parent

TODO

@@ -8,7 +8,6 @@
 - Configuration for:
   - crossfading
   - osd
-- If there's only one node in a library item then expand it when expanding the parent
 
 - Edit tags in playlist view
 - Disabled fields in tag editor

src/libraryview.cpp

@@ -59,6 +59,8 @@ LibraryView::LibraryView(QWidget* parent)
     nomusic_(":nomusic.png")
 {
   setItemDelegate(new LibraryItemDelegate(this));
+
+  connect(this, SIGNAL(expanded(QModelIndex)), SLOT(ItemExpanded(QModelIndex)));
 }
 
 void LibraryView::SetLibrary(Library *library) {
@@ -137,3 +139,8 @@ bool LibraryView::RecursivelyExpand(const QModelIndex& index, int* count) {
 
   return true;
 }
+
+void LibraryView::ItemExpanded(const QModelIndex& index) {
+  if (model()->rowCount(index) == 1)
+    expand(model()->index(0, 0, index));
+}

src/libraryview.h

@@ -34,6 +34,9 @@ class LibraryView : public QTreeView {
   void paintEvent(QPaintEvent* event);
   void mouseReleaseEvent(QMouseEvent* e);
 
+ private slots:
+  void ItemExpanded(const QModelIndex& index);
+
  private:
   void RecheckIsEmpty();
   bool RecursivelyExpand(const QModelIndex& index, int* count);