add 'istoplevel' argument to input.add_callback

src/logic/scripting/lua/libs/libinput.cpp

@@ -50,8 +50,11 @@ static int l_add_callback(lua::State* L) {
             handler = input.addKeyCallback(key, actual_callback);
         }
     }
-    auto callback = [&gui, actual_callback]() -> bool {
-        if (!gui.isFocusCaught()) {
+
+    bool isTopLevel = lua::toboolean(L, 4);
+
+    auto callback = [&gui, actual_callback, isTopLevel]() -> bool {
+        if (isTopLevel || !gui.isFocusCaught()) {
             return actual_callback();
         }
         return false;