Thank you Emmanuelle for your rapid and exhaustive reply.
Not having enabled animations sounds an extremely likely explanation - I
am using default settings and, migrating from Gtk2 to Gtk3 had not yet
"encountered" Settings.
However, I appear to advance from a learning problem to a
banging-your-head problem (I am using perl-Gtk3-0.19.0 ):
$gtk_settings = Gtk3::Settings->get_default ();
fails with "passed too many parameters (expected 0, got 1)"
and when I do what I really want (with gtk_screen properly set up - as
successfully used for caling StyleContext::add_provider_for_screen )
$gtk_settings = Gtk3::Settings->get_for_screen ( $gtk_screen );
with "passed too many parameters (expected 1, got 2)"
Not very encouraging, Juergen
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