### Godot version

4.0beta17

### System information

Linux Mint 21.1

### Issue description

When editing animations for the **frame** property of **Sprite2D**, the preview image does not respect the **region_rect** specified in the Sprite2D's properties.

Godot 4.0 (tested with alpha1 to beta17)
![Screenshot from 2023-02-05 21-19-29](https://user-images.githubusercontent.com/2348534/216868394-45a9dc42-ce4b-4b11-82cb-4491aea46d9b.png)

Godot 3.5
![Screenshot from 2023-02-05 21-19-43](https://user-images.githubusercontent.com/2348534/216868543-cff6eb60-a431-4138-8fa6-5c30a54de0e1.png)

As can be seen in the second screenshot, the region rect is applied to the key preview image in Godot 3.5, but is ignored in Godot 4.0.


### Steps to reproduce

Steps:

1. Set a region rect on a Sprite2D node
2. Add Sprite2D.frame as a track to an AnimationPlayer
3. Insert key
4. Key preview does not take region rect into account

### Minimal reproduction project

[MRP.zip](https://github.com/godotengine/godot/files/10637055/MRP.zip)

len_resizing_rel = CLAMP(ofs_local, -(len - prev_ofs_end - prev_ofs_start), prev_ofs_end) * get_timeline()->get_zoom_scale();
		}
		queue_redraw();
		accept_event();
		return;
	}
	Ref<InputEventMouseButton> mb = p_event;
	if (mb.is_valid() && mb->is_pressed() && mb->get_button_index() == MouseButton::LEFT && over_drag_position) {
		len_resizing = true;
		
		if (len_resizing_index < 0) {
			len_resizing = false;
			return;
		}
		len_resizing_from_px = mb->get_position().x;
		len_resizing_rel = 0;
		queue_redraw();
		accept_event();
		return;
	}
	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
	if (len_resizing && mb.is_valid() && !mb->is_pressed() && mb->get_button_index() == MouseButton::LEFT) {
		if (len_resizing_rel == 0 || len_resizing_index < 0) {
			len_resizing = false;
			return;
		}
		if (len_resizing_start) {
			float ofs_local = len_resizing_rel / get_timeline()->get_zoom_scale();
			float prev_ofs = get_animation()->audio_track_get_key_start_offset(get_track(), len_resizing_index);
			float prev_time = get_animation()->track_get_key_time(get_track(), len_resizing_index);