Function lgx_finding_diagnostics 

pub fn lgx_finding_diagnostics(
    findings: &[Finding],
    line_index: &LineIndex,
) -> Vec<Diagnostic>

The LGX template checker’s findings, as the editor shows them: at the element they are about, with the checker’s own severity and message.

The code is lgx- and the finding’s kind in kebab case (lgx-image-without-alt), one per kind, so a client can key on it the way it keys on a parse error’s code.