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prompt_toolkit: Ansi codes instead of color when an exception occurs during completion #1565

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@bambu

Description

Ansi codes are displayed in the console instead of the colors when an exception occurs when tab completing. This happens on the prompt-toolkit branch. On the main branch, the exception works as expected.

Easy way to reproduce the error on the prompt-toolkit branch is by modifying argparse_completion.py with the following:

diff --git a/examples/argparse_completion.py b/examples/argparse_completion.py
index 8d2c3dca..46aa5c8d 100755
--- a/examples/argparse_completion.py
+++ b/examples/argparse_completion.py
@@ -48,6 +48,7 @@ class ArgparseCompletion(Cmd):
 "These things can\ncontain newlines and\n",
 Text("styled text!!", style=Style(color=Color.BRIGHT_YELLOW, underline=True)),
 )
+ raise Exception("poc!")
 table_item = Table(
 "Left Column",

After running the output looks like this when attempting to tab complete completion_item:

python argparse_completion.py
?[1;91mException: ?[0mpoc!
?[93mTo enable full traceback, run the following command: ?[0m?[1;36mset debug true?[0m
?[1;91mException: ?[0mpoc!
?[93mTo enable full traceback, run the following command: ?[0m?[1;36mset debug true?[0m
(Cmd) example --completion_item 

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      AltStyle によって変換されたページ (->オリジナル) /