### 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
CanvasLight canvas_light;
	return canvas_light_owner.make_rid(canvas_light);
}
void RasterizerCanvasGLES3::light_set_texture(RID p_rid, RID p_texture) {
	GLES3::TextureStorage *texture_storage = GLES3::TextureStorage::get_singleton();
	CanvasLight *cl = canvas_light_owner.get_or_null(p_rid);
	ERR_FAIL_NULL(cl);
	if (cl->texture == p_texture) {
		return;
	}
	ERR_FAIL_COND(p_texture.is_valid() && !texture_storage->owns_texture(p_texture));
	if (cl->texture.is_valid()) {
		texture_storage->texture_remove_from_texture_atlas(cl->texture);
	}
	cl->texture = p_texture;
	if (cl->texture.is_valid()) {
		texture_storage->texture_add_to_texture_atlas(cl->texture);
	}
}
void RasterizerCanvasGLES3::light_set_use_shadow(RID p_rid, bool p_enable) {