GTK4: Here we go down this rabbit hole again. GTK 4.10 is deprecating tons of functionality with deficient replacement APIs. GtkComboBox is deprecated now suggesting GtkDropDown as a replacement, however GtkDropDown is just a list selection and does not have an editable entryfield version. I haven't completely gone through the changes, but I will attempt to switch to the new APIs where possible to reduce the number of deprecation warnings. This is the first set switching gtk_widget_hide/show() to use gtk_widget_set_visible() instead. This removes about 50 warnings.