LibGio#g_list_store_splice argument error

[BigBoyBarney]

Hi! Thanks for the bindings! 🥳

When trying to #splice an Enumerable of GObjects into a ListStore, i get the following error:

 275 | LibGio.g_list_store_splice(to_unsafe, position, n_removals, additions, n_additions)
                                                                   ^--------
Error: argument 'additions' of 'LibGio#g_list_store_splice' must be Pointer(LibGObject::Object), not Pointer(Pointer(Void))

Example code snippet:

list_store = Gio::ListStore.new(Gtk::Button.g_type)
one = Gtk::Button.new
two = Gtk::Button.new

items = [one, two]
list_store.splice(position: 0_u32, n_removals: 0_u32, additions: items)

[BigBoyBarney]

In the generated bindings: gi-crystal/src/auto/gio-2.0/list_store.cr at line 271

- additions = additions.to_a.map(&.to_unsafe).to_unsafe
+ additions = additions.to_a.map(&.to_unsafe).to_unsafe.as(Pointer(LibGObject::Object))

I assume in the binding generator this is in src/generator/arg_strategy.cr but honestly, I have no idea what I'm doing 🤣

- generate_array_to_unsafe(io, arg_name, arg.type_info)
+ generate_array_to_unsafe(io, arg_name, arg.type_info).as(Pointer(LibGObject::Object))

I have no idea whether this breaks anything else, but it solves this issue.

[BigBoyBarney]

This seems to be the case for all types using arg_strategy.

Gdk::Paintable#snapshot_symbolic similarly needs:

- colors = colors.to_a.map(&.to_unsafe).to_unsafe
+ colors = colors.to_a.map(&.to_unsafe).to_unsafe.as(Pointer(LibGdk::RGBA))