### 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
OccluderPolygon occluder;
	return occluder_polygon_owner.make_rid(occluder);
}
void RasterizerCanvasGLES3::occluder_polygon_set_shape(RID p_occluder, const Vector<Vector2> &p_points, bool p_closed) {
	OccluderPolygon *oc = occluder_polygon_owner.get_or_null(p_occluder);
	ERR_FAIL_NULL(oc);
	Vector<Vector2> lines;
	if (p_points.size()) {
		int lc = p_points.size() * 2;
		lines.resize(lc - (p_closed ? 0 : 2));
		{
			Vector2 *w = lines.ptrw();
			const Vector2 *r = p_points.ptr();
			int max = lc / 2;
			if (!p_closed) {
				max--;
			}
			for (int i = 0; i < max; i++) {
				Vector2 a = r[i];
				Vector2 b = r[(i + 1) % (lc / 2)];
				w[i * 2 + 0] = a;
				w[i * 2 + 1] = b;