bug#32344:

[Carlos Pita <carlosjosepita@gmail.com>]

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I can confirm that the patch cleanly applies on top of emacs-26 branch
too, but in any case here is a version rebased on top of that branch.

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From 1f2392f09b9c0193e79382512a8a30388ce54bf8 Mon Sep 17 00:00:00 2001
From: memeplex <carlosjosepita@gmail.com>
Date: Sun, 13 Oct 2019 13:57:11 -0300
Subject: [PATCH] Option for comint to honour original input highlighting

* comint.el (comint-send-input): add option to let major modes that
colorize their input (for example, python-mode) stop comint from
overriding that specialized colorization.
---
 lisp/comint.el | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/lisp/comint.el b/lisp/comint.el
index 4bb4367..b8f5205 100644
--- a/lisp/comint.el
+++ b/lisp/comint.el
@@ -223,6 +223,12 @@ comint-input-autoexpand
 		 (other :tag "on" t))
   :group 'comint)
 
+(defcustom comint-highlight-input t
+  "If non-nil, highlight input with `comint-highlight-input' face.
+Otherwise keep the original highlighting untouched."
+  :type 'boolean
+  :group 'comint)
+
 (defface comint-highlight-input '((t (:weight bold)))
   "Face to use to highlight user input."
   :group 'comint)
@@ -1881,9 +1887,10 @@ comint-send-input
               (end (if no-newline (point) (1- (point)))))
           (with-silent-modifications
             (when (> end beg)
-              (add-text-properties beg end
-                                   '(front-sticky t
-                                     font-lock-face comint-highlight-input))
+              (when comint-highlight-input
+               (add-text-properties beg end
+                                    '(front-sticky t
+                                      font-lock-face comint-highlight-input)))
               (unless comint-use-prompt-regexp
                 ;; Give old user input a field property of `input', to
                 ;; distinguish it from both process output and unsent
-- 
2.20.1