### 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 *oc = occluder_polygon_owner.get_or_null(p_occluder);
	ERR_FAIL_NULL(oc);
	oc->cull_mode = p_mode;
}
void RasterizerCanvasGLES3::set_shadow_texture_size(int p_size) {
	GLES3::Config *config = GLES3::Config::get_singleton();
	p_size = nearest_power_of_2_templated(p_size);
	if (p_size > config->max_texture_size) {
		p_size = config->max_texture_size;
		WARN_PRINT("Attempting to set CanvasItem shadow atlas size to " + itos(p_size) + " which is beyond limit of " + itos(config->max_texture_size) + "supported by hardware.");
	}
	if (p_size == state.shadow_texture_size) {
		return;
	}
	state.shadow_texture_size = p_size;
	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;
	}
	_update_shadow_atlas();
}
bool RasterizerCanvasGLES3::free(RID p_rid) {