cannot revert changes in PR #2761

PS: the text is only visible on hover. otherwise its white text on white background

Does it fail after "Committing..." or "Reverting..."?

Did you set a personal token and does it still have access to the repo? I just tested it and it works for me.

it fails after "Committing"

a PAT was configured. I just created a fresh one to be sure it is valid. the same error happens with the new token.

Can you try in Chrome? Firefox hides console errors

just tried in MS Edge. it works there (with the same token).

Check for errors in the browser console, it should include every error of the browser, so open it, clear it, and then try reverting it.

oh, I was looking into the wrong console.

in the browser console I can see a http 422 Unprocessable Entity error

Request headers for this request:

I can't reproduce any of these issues in Firefox 74 (not alpha); the dropdown message is visible without hovering it (the hover never appears, we're just using GitHub's own style for the dropdown anyway)

<img width="210" alt="&quot; src="https://user-images.githubusercontent.com/1402241/77157274-536aab80-6aa1-11ea-8053-7ca50f167082.png">

My guess is that Firefox alpha was misbehaving

This was the request the browser sent ("Copy as Fetch" from the Network tab)

await fetch("https://github.com/fregante/sandbox/tree-save/fregante-patch-2/history.csv", {
    "credentials": "include",
    "headers": {
        "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:74.0) Gecko/20100101 Firefox/74.0",
        "Accept": "*/*",
        "Accept-Language": "en-US,en;q=0.5",
        "Content-Type": "application/x-www-form-urlencoded"
    },
    "referrer": "https://github.com/fregante/sandbox/pull/6/files",
    "body": "authenticity_token=uaxzu4EZ5HmxA7MJ%2BK0P41zrhP9yNamzdmmQqeHoVq%2B6DxqAXpkkFRQJaW%2FUX77EA%3D%3D&filename=history.csv&new_filename=history.csv&commit=5b76c86b858897fdcb1e0ab4dedd65c138532fee&same_repo=1&pr=&content_changed=&value=lol%0A&message=Revert+history.csv&placeholder_message=Update+history.csv&description=&author_email=opensource%40bfred.it&commit-choice=direct&target_branch=fregante-patch-2&quick_pull=",
    "method": "POST",
    "mode": "cors"
});

Request headers

POST /fregante/sandbox/tree-save/fregante-patch-2/history.csv HTTP/1.1
Host: github.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:74.0) Gecko/20100101 Firefox/74.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: https://github.com/fregante/sandbox/pull/6/files
Content-Type: application/x-www-form-urlencoded
Origin: https://github.com
Content-Length: 435
DNT: 1
Connection: keep-alive
Cookie: ..................

Response headers

HTTP/1.1 302 Found
Date: Fri, 20 Mar 2020 10:53:50 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Server: GitHub.com
Status: 302 Found
Location: https://github.com/fregante/sandbox/blob/fregante-patch-2/history.csv
Cache-Control: no-cache
Set-Cookie: .................
Strict-Transport-Security: max-age=31536000; includeSubdomains; preload
X-Frame-Options: deny
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Expect-CT: max-age=2592000, report-uri="https://api.github.com/_private/browser/errors"
Content-Security-Policy: default-src 'none'; base-uri 'self'; block-all-mixed-content; connect-src 'self' uploads.github.com www.githubstatus.com collector.githubapp.com api.github.com www.google-analytics.com github-cloud.s3.amazonaws.com github-production-repository-file-5c1aeb.s3.amazonaws.com github-production-upload-manifest-file-7fdce7.s3.amazonaws.com github-production-user-asset-6210df.s3.amazonaws.com wss://live.github.com; font-src github.githubassets.com; form-action 'self' github.com gist.github.com; frame-ancestors 'none'; frame-src render.githubusercontent.com; img-src 'self' data: github.githubassets.com identicons.github.com collector.githubapp.com github-cloud.s3.amazonaws.com *.githubusercontent.com; manifest-src 'self'; media-src 'none'; script-src github.githubassets.com; style-src 'unsafe-inline' github.githubassets.com
Vary: X-PJAX, Accept-Encoding, Accept, X-Requested-With
X-GitHub-Request-Id: C9A5:3F635:2F771DB:444AE45:5E74A0BD