Python3.15.0a1 REPL : issue with pasting of Tab indented multiline code

Bug report

Bug description:

Misaligned output of pasted Tab-indented multiline code into the REPL:

~ $ python3.13
Python 3.13.8 (main, Oct 15 2025, 02:41:02) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt6.QtWidgets import QApplication, QWidget
... from PyQt6.QtGui import QPainter, QColor, QPen
... from PyQt6.QtCore import Qt, QRect
... from cv2 import (
...     cvtColor,
...         COLOR_Lab2RGB,
...         COLOR_HSV2RGB_FULL,
...         COLOR_HLS2RGB_FULL,
... 
...         COLOR_RGB2Lab,
...         COLOR_RGB2HSV_FULL,
...         COLOR_RGB2HLS_FULL,
... 
... )
... 
>>> exit
~ $ python3.15
Python 3.15.0a1 (main, Oct 17 2025, 14:09:27) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt6.QtWidgets import QApplication, QWidget
... from PyQt6.QtGui import QPainter, QColor, QPen
... from PyQt6.QtCore import Qt, QRect
... from cv2 import (
... 	cvtColor							,
                                                    ... 		COLOR_Lab2RGB				,
                                                                                         ... 		COLOR_HSV2RGB_FULL			,
... 		COLOR_HLS2RGB_FULL			,
                             ... 
                             ... 		COLOR_RGB2Lab				,
                                                                 ... 		COLOR_RGB2HSV_FULL			,
                                                                                           ... 		COLOR_RGB2HLS_FU... )			,
... 
>>> exit
~ $ 

CPython versions tested on:

3.15

Operating systems tested on:

Linux

Linked PRs

• gh-140697

Commencez par reproduire le collage multiligne montré, indenté avec des tabulations, dans la REPL Python 3.15 sous Linux et comparez sa sortie avec celle de Python 3.13. Le correctif est terminé lorsque le code multiligne collé reste correctement aligné au lieu d'acquérir de grands décalages d'espacement ; l'issue fait référence à la PR liée gh-140697.