Typing Underscore "_" in LaTeX File No Longer Auto-Inserts Braces "{}"

[lorenzohess]

I confirm that...

• I searched the FAQ, issue tracker, discussions board, documentation, and wiki, and did not find an answer to my question.

• Any discussions with or conclusions derived from the use of LLMs will be omitted from my question.

What is your question?

Previously, in a TeX file in math mode, typing underscore "_" would auto-insert curly braces "{}". So if you have $x|$ (where the pipe, |, is the cursor), adding an underscore, to get $x_|$ would then be followed by braces to get converted to $x_{|}$.

I recently updated Doom Emacs (several months worth of updates), and now this doesn't happen.

How can I recover this behavior?

More importantly, what methods can Emacs users use for: a) finding out things like which package or mode handles inserting the braces; and b) figuring out how to revert that change?

I suppose if I knew when I had last updated my Doom Emacs modules, then I could go through commit logs for all the modules and see if they contain something relevant. Or git bisect to do it more programatically?

System information

https://pastebin.com/fFJyMWeF

[wchmb]

Hi. They consider this a matter of taste
doomemacs/doomemacs#8426

Revert to old behavior with: (setq TeX-electric-sub-and-superscript t)