add allowsFiltering / allowsSearching checks

src/playlist.cpp

@@ -272,6 +272,11 @@ void Playlist::MouseButtonPressed(MEVENT me)
 
 /***********************************************************************/
 
+bool Playlist::allowsFiltering()
+{
+	return true;
+}
+
 std::string Playlist::currentFilter()
 {
 	std::string filter;
@@ -292,6 +297,11 @@ void Playlist::applyFilter(const std::string &filter)
 
 /***********************************************************************/
 
+bool Playlist::allowsSearching()
+{
+	return true;
+}
+
 bool Playlist::search(const std::string &constraint)
 {
 	bool result = false;