Reimplement interactive tests without gtk_main()
gtk_main() is gone in GTK 4, but the tests in the
tests/interactive/ directory currently rely on it.
GTK 4 removes the
gtk_main_*family of APIs. The recommended replacement is
GtkApplication, but you can also iterate the GLib main loop directly, using
GMainContextAPIs. The replacement for
g_main_context_pending(), the replacement for
In GTK 4, you can use this replacement that will iterate the default main loop until all windows have been closed:
while (g_list_model_get_n_items (gtk_window_get_toplevels ()) > 0) g_main_context_iteration (NULL, TRUE);
In order to port to GTK 4, we must either solve this issue soon or disable the interactive tests and fix this later.