### 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
glDeleteVertexArrays(1, &data.canvas_quad_array);
	glDeleteBuffers(1, &data.canvas_quad_vertices);
	glDeleteVertexArrays(1, &data.canvas_quad_array);
	GLES3::TextureStorage::get_singleton()->canvas_texture_free(default_canvas_texture);
	memdelete_arr(state.instance_data_array);
	memdelete_arr(state.light_uniforms);
	if (state.shadow_fb != 0) {
		glDeleteFramebuffers(1, &state.shadow_fb);
		GLES3::Utilities::get_singleton()->texture_free_data(state.shadow_texture);
		glDeleteRenderbuffers(1, &state.shadow_depth_buffer);
		state.shadow_fb = 0;
		state.shadow_texture = 0;
		state.shadow_depth_buffer = 0;
	}
	for (uint32_t i = 0; i < state.canvas_instance_data_buffers.size(); i++) {
		for (int j = 0; j < state.canvas_instance_data_buffers[i].instance_buffers.size(); j++) {
			if (state.canvas_instance_data_buffers[i].instance_buffers[j]) {
				GLES3::Utilities::get_singleton()->buffer_free_data(state.canvas_instance_data_buffers[i].instance_buffers[j]);
			}
		}
		if (state.canvas_instance_data_buffers[i].light_ubo) {
			GLES3::Utilities::get_singleton()->buffer_free_data(state.canvas_instance_data_buffers[i].light_ubo);
		}
		if (state.canvas_instance_data_buffers[i].state_ubo) {
			GLES3::Utilities::get_singleton()->buffer_free_data(state.canvas_instance_data_buffers[i].state_ubo);
		}
	}
}
#endif