- Update to 13.4
* AUCTeX now requires GNU Emacs 26.1 or higher.
* LaTeX abbrevs are now available in docTeX mode buffers.
* AUCTeX temporarily rebinds the variable ‘gc-cons-percentage’ to a
higher value during parsing which speeds up the process
significantly. The memory pressure should still be acceptable,
even on older machines.
* Macros provided by the ‘xparse’ package are part of LaTeX kernel
since October 2020. AUCTeX tracks this change and the content of
‘xparse.el’ is moved into ‘latex.el’ and ‘font-latex.el’
respectively.
* The variable ‘preview-scale-function’ is now allowed as a
file-local variable where the assigned value can only be between
0.1 and 10.

* AUCTeX no longer refuses to insert dollar sign when you type ‘$’ at