Wt

The code below can reproduce the problem.

  buttonA->clicked().connect(std::bind([parent](){

    auto dia = new WDialog("Personalia", parent);
    new Wt::WText("Enter your name: ", dia->contents());
    new Wt::WLineEdit(dia->contents());
    new Wt::WBreak(dia->contents());
    new Wt::WPushButton("Ok", dia->contents());

    dia->setObjectName("XXX"); //! < The bug is not reproducible without this line. 
    dia->setModal(true);
    dia->setTransient(true);
    dia->show();
  }));

Or, use the attached project to reproduce the problem.

Step to reproduce

Please ensure that the default resources folder is supplied to docroot.

1. Click test Dialog.
   
2. Click outside the Dialog, the dialog will be closed. The background will be intractable.
   
3. Click test Dialog with ObjectName.
   
4. Click outside the Dialog, the dialog will be closed, but the background will not be intractable and not stop graying out. The ``signal not exposed'' will show on log.

Wt version:

Wt Github bac28e1d4d828622b3255a28319ecf2d6fbe88af