New API in gtkmm 4.18

Member Gtk::ColorDialogButton::signal_activate ()

Member Gtk::DropDown::signal_activate ()

Member Gtk::Expander::signal_activate ()

Member Gtk::FontDialogButton::signal_activate ()

Member Gtk::MenuButton::signal_activate ()

Member Gtk::PasswordEntry::signal_activate ()

Member Gtk::SearchEntry2::signal_activate ()

Member Gtk::Text::signal_activate ()