`isRepoRoot` doesn't work on branches with slashes

[fregante]

I think I found a way to determine isRepoRoot: use the title

/fregante/github-url-detection	fregante/github-url-detection: Which GitHub page are you on? Is it an issue? Is it a list? Perfect for your WebExtension or userscript
/fregante/github-url-detection/tree/npm-test	fregante/github-url-detection at npm-test
/fregante/github-url-detection/tree/npm-test/esm	github-url-detection/esm at npm-test · fregante/github-url-detection

You can see 2 behaviors:

• isRepoRoot starts with getRepoURL
• isRepoTree does not (but ends with getRepoURL)
  • warning: if the repo is called fregante/fregante and the folder is fregante, then title starts with fregante/fregante and ends with fregante/fregante

The code might be:

const isRepoRoot = (url) => /^(tree\/[^/]+)?$/.test(getRepoPath(url)!) || (!url && document.title.startsWith(getRepoURL()) && !document.title.endsWith(getRepoURL()))

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Originally discussed at refined-github/refined-github#3254 (comment)