### Godot version

4.0.rc6.mono.official

### System information

macOS 12.0.1

### Issue description

Just a minor visual issue.

When opening an empty directory the focus highlight is drawn incorrectly. It looks like the UI is drawing a smaller rectangle within the main rect:
<img width="1058" alt="Bildschirmfoto 2023-02-28 um 14 13 31" src="https://user-images.githubusercontent.com/11627131/221868794-7450606d-e758-4104-8f33-182d9779d7f8.png">


This behavior also changes when you hover over other items in the view, so I'm not sure if this a general issue with the focus highlighting or just an issue in the directory view:
<img width="1052" alt="Bildschirmfoto 2023-02-28 um 14 32 54" src="https://user-images.githubusercontent.com/11627131/221869308-4756f26e-cda2-4057-be1e-7439030895dc.png">


### Steps to reproduce

1. New Project
2. Browse
3. Create Folder
4. Click or Tab to set focus on the empty directory view

### Minimal reproduction project

N/A
if (update_skeletons) {
					mesh_storage->update_mesh_instances();
					update_skeletons = false;
				}
				
				_render_items(p_to_render_target, item_count, canvas_transform_inverse, p_light_list, r_sdf_used);
				item_count = 0;
				if (ci->canvas_group_owner->canvas_group->mode != RS::CANVAS_GROUP_MODE_TRANSPARENT) {
					Rect2i group_rect = ci->canvas_group_owner->global_rect_cache;
					texture_storage->render_target_copy_to_back_buffer(p_to_render_target, group_rect, false);
					if (ci->canvas_group_owner->canvas_group->mode == RS::CANVAS_GROUP_MODE_CLIP_AND_DRAW) {
						ci->canvas_group_owner->use_canvas_group = false;
						items[item_count++] = ci->canvas_group_owner;
					}
				} else if (!backbuffer_cleared) {
					texture_storage->render_target_clear_back_buffer(p_to_render_target, Rect2i(), Color(0, 0, 0, 0));
					backbuffer_cleared = true;
				}
				backbuffer_copy = false;
				canvas_group_owner = ci->canvas_group_owner; 
			}
			ci->canvas_group_owner = nullptr; 
		}
		if (canvas_group_owner == nullptr && ci->canvas_group != nullptr && ci->canvas_group->mode != RS::CANVAS_GROUP_MODE_CLIP_AND_DRAW) {
			skip_item = true;
		}
		if (ci == canvas_group_owner) {
			if (update_skeletons) {
				mesh_storage->update_mesh_instances();
				update_skeletons = false;