Pass diagnostic description as list to fit Flymake columns

[jleechpe]

Flymake supports the diagnostic info being passed as a list of '(origin code msg) which then maps to the columns.

INFO is a description of the problem detected. It may be a string, or
list (ORIGIN CODE MESSAGE) appropriately categorizing and describing the
diagnostic. ORIGIN may be a string or nil. CODE maybe be a string, a
number or nil. MESSAGE must be a string.

This changes it to use this functionality and end up consistent with Eglot LSP outputs

[erickgnavar]

I got this error when trying to show diagnostics. I'm using emacs 30

[jleechpe]

Ah, it requires flymake 1.4.1 (available via elpa or built-in on the emacs-31 branch). I guess this should either wait for that or add to package-requires.

I normally run off of emacs-git so didn't notice, switched to current version and got an error when using the updated code, update the package through elpa and it started working again.

[erickgnavar]

Ah, it requires flymake 1.4.1 (available via elpa or built-in on the emacs-31 branch). I guess this should either wait for that or add to package-requires.

I normally run off of emacs-git so didn't notice, switched to current version and got an error when using the updated code, update the package through elpa and it started working again.

I don't think that requiring a newest version of flymake is a good idea, it might have conflicts with other packages for who is not using emacs 31.

For now we can leave the PR open until the required version of flymake is included in emacs 30(I don't know how this works TBH) or wait until emacs 31 is the latest stable release

Another approach could be check somehow if the current installation of flymake has the feature required for this change, if so we can use this change otherwise just fallback to the existing code