deactivate history buttons by default

src/app/browser/main/tab/page/navbar/history/back.cpp

@@ -15,6 +15,10 @@ Back::Back()
     set_tooltip_text(
         _("Back")
     );
+
+    set_sensitive(
+        false // @TODO no effect by set_action_name
+    );
 }
 
 Back::~Back() = default;

src/app/browser/main/tab/page/navbar/history/forward.cpp

@@ -15,6 +15,10 @@ Forward::Forward()
     set_tooltip_text(
         _("Forward")
     );
+
+    set_sensitive(
+        false // @TODO no effect by set_action_name
+    );
 }
 
 Forward::~Forward() = default;