add dropdown annimation to library & internet tree view

src/internet/core/internetview.cpp

@@ -32,6 +32,7 @@ InternetView::InternetView(QWidget* parent) : AutoExpandingTreeView(parent) {
   SetExpandOnReset(false);
   setAttribute(Qt::WA_MacShowFocusRect, false);
   setSelectionMode(QAbstractItemView::ExtendedSelection);
+  setAnimated(true);
 }
 
 void InternetView::contextMenuEvent(QContextMenuEvent* e) {

src/library/libraryview.cpp

@@ -185,6 +185,7 @@ LibraryView::LibraryView(QWidget* parent)
   setSelectionMode(QAbstractItemView::ExtendedSelection);
 
   setStyleSheet("QTreeView::item{padding-top:1px;}");
+  setAnimated(true);
 }
 
 LibraryView::~LibraryView() {}