fix: wrong sidebar_label and title on versioned_docs

[endiliey]

Motivation

Fix #1259

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Use this reproducible demo https://github.com/amimas/docusaurus-1259

Use this PR patch

Go to /docs/.

Note that the v1.0.0 docs file is like this:

---
id: version-1.0.0-index
title: This is main page
sidebar_label: Main page
original_id: index
---

## Mauris In Code

Mauris vestibulum ullamcorper nibh, ut semper purus pulvinar ut. Donec volutpat orci sit amet mauris malesuada, non pulvinar augue aliquam. Vestibulum ultricies at urna ut suscipit. Morbi iaculis, erat at imperdiet semper, ipsum nulla sodales erat, eget tincidunt justo dui quis justo. Pellentesque dictum bibendum diam at aliquet. Sed pulvinar, dolor quis finibus ornare, eros odio facilisis erat, eu rhoncus nunc dui sed ex. Nunc gravida dui massa, sed ornare arcu tincidunt sit amet. Maecenas efficitur sapien neque, a laoreet libero feugiat ut.

Before (wrong sidebar_label and title)

After

[docusaurus-bot]

Deploy preview for docusaurus-preview ready!

Built with commit 5accf5c

https://deploy-preview-1265--docusaurus-preview.netlify.com

[docusaurus-bot]

Deploy preview for docusaurus-preview ready!

Built with commit 065eb09

https://deploy-preview-1265--docusaurus-preview.netlify.com

[JoelMarcey]

Has this problem always existed? We have a few projects that use versioning, and I don't recall this happening.

[endiliey]

Happens only if the next release document changed its sidebar_label/title, and there are two files with the same id (but different subdirectory).

Its quite rare, i guess