### 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
if (c->type == Item::Command::TYPE_MESH) {
					const Item::CommandMesh *m = static_cast<const Item::CommandMesh *>(c);
					state.canvas_instance_batches[state.current_batch_index].tex = m->texture;
					_update_transform_2d_to_mat2x3(base_transform * draw_transform * m->transform, state.instance_data_array[r_index].world);
					modulate = m->modulate;
				} else if (c->type == Item::Command::TYPE_MULTIMESH) {
					const Item::CommandMultiMesh *mm = static_cast<const Item::CommandMultiMesh *>(c);
					state.canvas_instance_batches[state.current_batch_index].tex = mm->texture;
					state.canvas_instance_batches[state.current_batch_index].shader_variant = CanvasShaderGLES3::MODE_INSTANCED;
					if (GLES3::MeshStorage::get_singleton()->multimesh_uses_colors(mm->multimesh)) {
						state.instance_data_array[r_index].flags |= FLAGS_INSTANCING_HAS_COLORS;
					}
					if (GLES3::MeshStorage::get_singleton()->multimesh_uses_custom_data(mm->multimesh)) {
						state.instance_data_array[r_index].flags |= FLAGS_INSTANCING_HAS_CUSTOM_DATA;
					}
				} else if (c->type == Item::Command::TYPE_PARTICLES) {
					GLES3::ParticlesStorage *particles_storage = GLES3::ParticlesStorage::get_singleton();
					GLES3::TextureStorage *texture_storage = GLES3::TextureStorage::get_singleton();
					const Item::CommandParticles *pt = static_cast<const Item::CommandParticles *>(c);
					RID particles = pt->particles;
					state.canvas_instance_batches[state.current_batch_index].tex = pt->texture;
					state.canvas_instance_batches[state.current_batch_index].shader_variant = CanvasShaderGLES3::MODE_INSTANCED;
					state.instance_data_array[r_index].flags |= FLAGS_INSTANCING_HAS_COLORS;
					state.instance_data_array[r_index].flags |= FLAGS_INSTANCING_HAS_CUSTOM_DATA;
					if (particles_storage->particles_has_collision(particles) && texture_storage->render_target_is_sdf_enabled(p_render_target)) {
						
						Transform2D xform = p_item->final_transform;
						GLuint sdf_texture = texture_storage->render_target_get_sdf_texture(p_render_target);
						Rect2 to_screen;
						{