how to activate AucTeX in poly-R for Rnw files

[sfg]

Hi all,

I am not sure if the following problem is an ESS, polymode or a local problem: Since a few weeks LaTeX mode is activated when opening a Rnw file (for Sweave), not the AucTeX mode (LaTeX/PM). I can activate the reftex-mode and cdlatex-mode after opening the Rnw file, but I have not managed to activate auctex in polymode. Some weeks before AucTeX and polymode were loaded when opening a Rnw file.

I use emacs 29.3, ess, auctex, poly-R and polymode from MELPA.

My configurartion in init.el:

(use-package ess-r-mode
:bind
(:map ess-r-mode-map
("_" . ess-insert-assign))
(:map inferior-ess-r-mode-map
("_" . ess-insert-assign))
)
(use-package poly-R
:ensure t)

Best, Sven