For this project I've been using the Rust bindings (relevant ticket here: https://github.com/gtk-rs/gtk/issues/432), but it doesn't appear to be related to those and instead be a backend issue.

What's happening is that if I create a GtkScale like so:

GtkScale *scale = gtk_scale_new_with_range(GTK_ORIENTATION_HORIZONTAL, 1.0, 2.0, 1.0);
gtk_scale_add_mark(1.0, GTK_POS_BOTTOM, "1");
gtk_scale_add_mark(2.0, GTK_POS_BOTTOM, "2");

Everything works as expected, where the scale has limits at 1.0 and 2.0 and the snap is to those two locations.

Now if I change things by adding a `gtk_scale_set_draw_value(scale, FALSE)`, the snap points are no longer to 1.0 and 2.0 and instead the slider can be placed anywhere in between.

And calling `gtk_scale_set_digits(.., 0)` doesn't fix the solution while set_draw_value is still called with `FALSE`.

But a kind-of work around is to not call `gtk_scale_set_draw_value(.., FALSE)` and instead do both `gtk_scale_set_digits(.., 0)` and connect the `format-value` signal to return just an empty string, but then there's a bunch of space above the slider that's just empty.