### 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
backbuffer_gen_mipmaps = false;
			material_screen_texture_mipmaps_cached = true;
		}
		
		if (skip_item) {
			skip_item = false;
		} else {
			items[item_count++] = ci;
		}
		if (!ci->next || item_count == MAX_RENDER_ITEMS - 1) {
			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, canvas_group_owner != nullptr);
			
			item_count = 0;
		}
		ci = ci->next;
	}
	if (time_used) {
		RenderingServerDefault::redraw_request();
	}
	state.canvas_instance_data_buffers[state.current_data_buffer_index].fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
	
	reset_canvas();
	state.current_data_buffer_index = (state.current_data_buffer_index + 1) % state.canvas_instance_data_buffers.size();
	state.current_instance_buffer_index = 0;
}
void RasterizerCanvasGLES3::_render_items(RID p_to_render_target, int p_item_count, const Transform2D &p_canvas_transform_inverse, Light *p_lights, bool &r_sdf_used, bool p_to_backbuffer) {