### 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)

lines.push_back(Point2(x + 1, y));
				}
			}
			colorv.push_back(color);
		}
		if (lines.size() > 2) {
			RS::get_singleton()->canvas_item_add_multiline(get_canvas_item(), lines, colorv);
		}
		int limit = to_x - from_x - 4;
		if (limit > 0) {
			draw_string(font, Point2(from_x + 2, int(get_size().height - font->get_height(font_size)) / 2 + font->get_ascent(font_size)), anim, HORIZONTAL_ALIGNMENT_LEFT, -1, font_size, color);
		}
		if (p_selected) {
			Color accent = get_theme_color(SNAME("accent_color"), SNAME("Editor"));
			draw_rect(rect, accent, false);
		}
	} else {
		Ref<Font> font = get_theme_font(SNAME("font"), SNAME("Label"));
		int font_size = get_theme_font_size(SNAME("font_size"), SNAME("Label"));
		int fh = font->get_height(font_size) * 0.8;
		Rect2 rect(Vector2(p_x, int(get_size().height - fh) / 2), Size2(fh, fh));
		Color color = get_theme_color(SNAME("font_color"), SNAME("Label"));
		draw_rect_clipped(rect, color);
		if (p_selected) {
			Color accent = get_theme_color(SNAME("accent_color"), SNAME("Editor"));
			draw_rect_clipped(rect, accent, false);
		}
	}
}
void AnimationTrackEditTypeAnimation::set_node(Object *p_object) {