Hi,

have a buffer connected with a Python-process, however not in 
comint-mode - for speed. See upper window in attachment not-point-max.png.

In the case given "import json" was sent to this buffer by a function 
‘py-fast-send-string’ which is shown partially in window below.

This function checks for a newline-char at the end of the string - 
actually an extra "\n" was sent inside this or-clause.

After sending "\n", second-cursor in output-buffer is shown after the 
newly inserted prompt at EOB. However, when or-clause returns, the 
cursor jumps back to the position before the last prompt started, i.e. 
at position before sending.

An extra (goto-char (point-max)) as shown in code would help, but 
shouldn't be necessary.

Any explanation? A bug?

Thanks,
Andreas
GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32, 
cairo version 1.16.0) of 2020-04-06