gi-gtk-4.0.1: Gtk.overrides

C-docs-url Gtk https://developer.gnome.org/gtk4/stable

# The introspection annotation marks the parameters as
# (out caller-allocates), but it is just a pointer to a GValue.
set-attr Gtk/TreeModelFilterModifyFunc/@parameters/value direction in
set-attr Gtk/TreeModelFilterModifyFunc/@parameters/value caller-allocates 0

# It is useful to expose these class structs when deriving new types
set-attr Gtk/WidgetClass haskell-gi-force-visible 1
set-attr Gtk/ContainerClass haskell-gi-force-visible 1