bug#39971: 28.0.50; Behavior change in flymake-diagnostic-beg/end

[Lars Ingebrigtsen]

João Távora <joaotavora@gmail.com> writes:

> It doesn't have to, and that's good.  It means we can hide the
> implementation.  If you can come up with a simple enough doc fix that
> expresses that flymake-diagnostic-beg/end can only be invoked on
> diagnostics that have been reported to Flymake, I'll merge it.
>
> Also, we can make the error message a bit friendlier to express that
> fact, so maybe include that in your patch?

I've now done so in Emacs 28.  Feel free to change.

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