[Gtk3] GtkShortcutsWindow loaded from an ui file from Python don't set the section-name property
Steps to reproduce
Example to reproduce
shortcuts_gtk3.py keyboard_shortcuts.ui
Current behavior
The GtkShortcutsWindow open in a strange state not showing the corrent information.
shortcuts.props.section_name='internal-search
Expected outcome
It works fine when using Gtk4, using this example code shortcuts_gtk4.py
shortcuts.props.section_name='shortcuts'
Version information
Fedora 34 (Workstation)
gtk3.x86_64 3.24.29-1.fc34 @updates
gtk4.x86_64 4.2.1-1.fc34 @updates
python3.x86_64 3.9.5-2.fc34 @updates
python3-gobject.x86_64 3.40.1-1.fc34 @updates-testing