Polymode crashes Emacs 29 for Windows

[AntonioFasano]

Steps to reproduce in a freshly installed Windows 10 virtual machine hosted in Linux.

1. Download Emacs 29.1_1 or 29.2_1, see links:
   http://ftpmirror.gnu.org/emacs/windows/emacs-29/emacs-29.1_1.zip
   http://ftpmirror.gnu.org/emacs/windows/emacs-29/emacs-29.2_1.zip

2. Extract the zip and start Emacs with:
   runemacs.exe -Q

3. Evaluate the following expressions:

 (require 'package)
 (add-to-list 'package-archives  '("stable-melpa" . "https://stable.melpa.org/packages/"))
 (list-packages)

4. Install ess and poly-R packages from the stable MELPA archive.

5. Evaluate the following expressions:

 (let ((default-directory user-emacs-directory))
   (normal-top-level-add-subdirs-to-load-path))
 (setopt inferior-R-program-name "path to your R/bin/x64/Rterm.exe")
 (require 'poly-R)

6. Open a relatively large Rmd document.

7. On an R code chunk, type C-return to start the inferior R buffer.

8. Finally, navigate the document via the Polymode menu with Next/Previous chunk entries.
   Don't use key bindings, but the mouse and, in particular, use the same-type chunk entry in the menu.

May be after 10/15 chunk visits, like said above, Emacs crashes. Probably, the test works better if you do not disable the default Windows real-time virus & threat protection settings (active).

Specifically, for version 29.1_1, it just suddenly closes, so there are not many useful details.
For 29.2_1 it gets stuck. If you kill Rterm in Windows Task Manager, functionality seems to be restored, but only at keyboard level. Clicking with the mouse pointer is ineffective. I was unable to reproduce with ordinary R files in r-mode buffers, using the ESS menu eval entries, and similarly in Polymode using the key bindings, rather than the menu bar, I do not get errors.

As it seems, the bug is a mouse thing and is related to comint communication with the R process. The menu somehow queries R to navigate chunks and loses sync with the process, then it remains stuck waiting for an answer.

[mguzmann]

I am having the same issue in Linux.