Is it possible for auctex to display missing references differently to ones which are in the bib file? Currently, all references look identical so it's impossible to tell at a glance which citation keys are defined in the bib file, and which are not. Texstudio does this quite nicely.
book.tex
:
\documentclass{book}
\usepackage[backend=biber]{biblatex}
\addbibresource{bib.bib}
\begin{document}
This reference exists \autocite{ref1}.
This reference does not \autocite{ref2}.
% A squiggle, red, anything different to show "ref2" differently to "ref1" would be lovely.
\end{document}
book.bib
:
@misc{ref1, ...}