set_name() not working on Gtk.ListBox
Steps to reproduce
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Current behavior
Using set_name() or set_css_name() does not seem to be being applied to Gtk.ListBox. This is according to, I'm guessing Gtk Inspector, when I enable Window.set_interactive_debugging() to true. The name will apply if I use Gtk Inspector to set it but it's NOT being set by my application. My application is written in Vala, NOT C, so this might be a Vala issue...
Expected outcome
I'm expecting set_name(), set_css_name() to do their respective duties.
Version information
Gtk3+ Version: 3.22.30
OS: Xubuntu 18.04.4