bug#59421: 28.2; python-mode breaks literal tabs when entering a command in the buffer

[Alexandre Hannud Abdo]

Ni! Hello,

I notice that python-mode is interpreting literal tabs when receiving a command from the buffer, which notably becomes an issue when pasting data, e.g. from "tab separated" table into a string. It also affects pasting code containing tabs, but strangely doesn't affect indentation tabs, so only the string case seems of concern.

After starting emacs and 'M-x run-python':

```

Python 3.9.9 (main, Jan  1 1970, 00:00:01)

Type 'copyright', 'credits' or 'license' for more information

IPython 8.2.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: text = "F    oo"

0__dummy_completion__  1__dummy_completion__ 

In [5]: text

Out[5]: 'Foo'

In [6]:

```

At "In [1]", the spaces after "F" should be replaced by a literal TAB (pasted or C-q TAB).

At "In [5]", the TAB is absent in the variable "text".

This works fine in a regular ipython REPL.

This is bugging me as I haven't found any way to use text with TABs in emacs python-mode.

It seems to have been treated as a completion trigger, given the dummy completion messages.

More generally:

This works in a regular ipython REPL, but doesn't within emacs:

```
In [7]: def    foo(): pass
def

0__dummy_completion__  1__dummy_completion__  
  Input In [15]
    deffoo(): pass
              ^
SyntaxError: invalid syntax


In [8]:

```

At "In [7]" the spaces after "def" should be replaced by a literal TAB.

This also works fine in a regular ipython REPL.

Surprisingly, the code below (replacing space indentations by literal TABs) works, though the dummy completion messages are still there.

```

In [9]: for _ in []:
    ...:     for _ in []:

0__dummy_completion__  1__dummy_completion__  
    ...:         pass

0__dummy_completion__  1__dummy_completion__  

0__dummy_completion__  1__dummy_completion__  
    ...:

In [10]:

```

Let me know if I can help. Best,

ale

--

In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0)

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