add allowsFiltering / allowsSearching checks

src/browser.cpp

@@ -267,6 +267,11 @@ void Browser::MouseButtonPressed(MEVENT me)
 
 /***********************************************************************/
 
+bool Browser::allowsFiltering()
+{
+	return true;
+}
+
 std::string Browser::currentFilter()
 {
 	return RegexFilter<MPD::Item>::currentFilter(*w);
@@ -282,6 +287,11 @@ void Browser::applyFilter(const std::string &filter)
 
 /***********************************************************************/
 
+bool Browser::allowsSearching()
+{
+	return true;
+}
+
 bool Browser::search(const std::string &constraint)
 {
 	auto fun = std::bind(BrowserEntryMatcher, _1, _2, false);