### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

Godot v4.1.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (nvidia) - Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz (6 Threads)

### Issue description

`Area2D`s which extend beyond the bounds of the root viewport, eg. when using a `canvas_items` stretch mode, receive mouse input events even in the black bands letterboxing the game:

https://github.com/godotengine/godot/assets/441188/3beb962f-c1fa-4098-a375-f3d862013577


### Steps to reproduce

1. Set project stretch mode to either `canvas_items` or `viewport`
2. Have an `Area2D` whose `CollisionShape` extends beyond the bounds of the rendered region
3. Connect the `Area2D`'s `mouse_[entered|exited]` signal to something
4. Wave the mouse around in the black areas outside the rendered game

### Minimal reproduction project

Project used for video demo above:

[area2d-oob.zip](https://github.com/godotengine/godot/files/12207031/area2d-oob.zip)

This only demos `mouse_[entered|exited]`, but I first encountered this with the `Area2D.input_event` signal, where it received mouse clicks as well.
}
		}
#endif 
	}
}
RID Viewport::get_viewport_rid() const {
	ERR_READ_THREAD_GUARD_V(RID());
	return viewport;
}
void Viewport::update_canvas_items() {
	ERR_MAIN_THREAD_GUARD;
	if (!is_inside_tree()) {
		return;
	}
	_update_canvas_items(this);
}
void Viewport::_set_size(const Size2i &p_size, const Size2i &p_size_2d_override, bool p_allocated) {
	Transform2D stretch_transform_new = Transform2D();
	if (is_size_2d_override_stretch_enabled() && p_size_2d_override.width > 0 && p_size_2d_override.height > 0) {
		Size2 scale = Size2(p_size) / Size2(p_size_2d_override);
		stretch_transform_new.scale(scale);
	}
	Size2i new_size = p_size.max(Size2i(2, 2));
	if (size == new_size && size_allocated == p_allocated && stretch_transform == stretch_transform_new && p_size_2d_override == size_2d_override) {
		return;
	}
	size = new_size;
	size_allocated = p_allocated;
	size_2d_override = p_size_2d_override;
	stretch_transform = stretch_transform_new;