Open EditEntryWidget when empty url column is activated.

src/gui/DatabaseWidget.h

@@ -23,6 +23,8 @@
 
 #include "core/Global.h"
 
+#include "gui/entry/EntryModel.h"
+
 class ChangeMasterKeyWidget;
 class DatabaseOpenWidget;
 class DatabaseSettingsWidget;
@@ -104,6 +106,7 @@ public Q_SLOTS:
     void emitEntryContextMenuRequested(const QPoint& pos);
 
 private Q_SLOTS:
+    void entryActivationSignalReceived(Entry* entry, EntryModel::ModelColumn column);
     void switchBackToEntryEdit();
     void switchToView(bool accepted);
     void switchToHistoryView(Entry* entry);