haraldschilly
commented
6 years ago ok, looks like there is nothing for that. the goal is to read the concordance file (and cache it if fresh) and do the line number translation for the errors. I haven't found a syntax description, but here seems to be the source code: https://rdrr.io/cran/knitr/src/R/concordance.R
So, the background of this is that tex files are produced by knitr for rtex or rnw files. forward/inverse search uses "reconciliation" to match the line numbers. That's why it works fine.
However, we should also use that for the line number errors. I don't remember having done anything towards that, I probably never thought about this at all. Below is a screenshot showing the discrepancy.