bug#32344: 26.1; Option to avoid comint highlighting input

[Carlos Pita]

Some modes (at least python.el) do their own input coloring according to
the major mode font locking rules. It's unfortunate that comint then
overwrites this coloring with comint-highlight-input face. Now, avoding
this is as simple as removing

    (add-text-properties beg end
                         '(front-sticky t
                           font-lock-face comint-highlight-input))

from comint-send-input. The problem is that these 3 lines are buried
down into a long function and it's not possible to cleanly disable them,
except maybe by an around advice that redefines add-text-properties.

There is an even more unfortunate consequence of this: for multiline
inputs all but the last line will be fontified by
comint-highlight-input. I had reported that in
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=32315 which now I'm going
to close since it's obviously a particular manifestation of comint
forcing the recoloring of previous inputs.

Please add a customization variable to make this behavior optional so
that modes that colorize input can keep their colors in previous inputs
and in previous lines of the current input.


---


in GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-07-05 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12000000
Recent messages:
Note: file is write protected
Mark saved where search started [2 times]
Mark set
kill-region: Buffer is read-only: #<buffer comint.el.gz>
Mark set [2 times]
Saved text until "'comint-output-filter-functions "")))))
"
Mark set [2 times]
comint-send-input
Mark activated

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