Obligatory links:

• Reverts mypy_primer: truncate per-project output #14091
• Original issue: Truncating mypy_primer output per project #14059

Actually, are you sure that KotlinIsland/basedmypy#357 (comment) is pushing the limit?

In particular, in #14059 there are two issues being discussed:

• comments that are long enough to be rejected by GitHub API
• a single project "monopolizing" the report

Trial and error shows that this is the longest comment GitHub would accept:

python3 -c 'print("x" * (2**18 - 2))'  | pbcopy

Meanwhile, the UI says the maximum length is 65,535 characters, which is probably isn't far from the truth when taking Unicode into consideration.

Actually, are you sure that KotlinIsland/basedmypy#357 (comment) is pushing the limit?

Ergh, I knew it was too good to be true :(. So basically the problem with the current solution is that I don't see all the diff, I can see three solutions:

1. Include more of the diff to fill out the comment limit, not a full form solution, as a big diff could over fill it.
2. comment multiple times
3. when the comment is truncated, include a link to the action output which will contain the full form diff.

I've updated this PR to meet option 1, happy to accept other ideas.

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

A "core dump" in a comment is not what comments were made for, so GitHub's UI is not particularly accommodating for that use case, and it can also interfere with our normal communications around PRs in comments.

Maybe opt for shorter output that only gives a "taste" for what changed, and a link to the artifact download URL, e.g. matchArtifact.archive_download_url?

I think that linking to a downloadable zip is not an idea UX (although would be an improvement).

What if we always put the changes in a details? I'll put something together...

Also check that "Details" don't slow down scrolling etc. (And then maybe Details per project?)

I like the idea of including a link to artifact download if we truncated things.