src: Fixes for release

* clear references count when clearing code view
* fixed scrolling to character in overview lists
* fixed aggregation activation shown in history menu
* fixed same snippet being added twice
* Sourcetrail [Trial] as window title
* fixed undoing trail expand will always reactivate symbol

src/lib_gui/qt/element/QtCodeNavigator.cpp

@@ -229,6 +229,8 @@ void QtCodeNavigator::clear()
 {
 	clearCodeSnippets();
 	clearCaches();
+
+	updateRefLabel();
 }
 
 void QtCodeNavigator::clearCodeSnippets()