bpo-42819: disable Readline bracketed paste

[dtrodrigues]

This prevents bracketed paste from being enabled in the interactive interpreter so that paste works as expected.

https://bugs.python.org/issue42819

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[dtrodrigues]

I rebased and force-pushed now that #24110 has been merged to fix the broken docs so that CI will pass on this PR.

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[dtrodrigues]

(in response to stale label) This issue still exists in Python so the PR is relevant.

[hroncok]

I'll test this.

In the meantime, could you please explain why is the addition needed at two different places? Thanks.

(Note that I am not familiar with readline or the way Python uses it, I'm just the Fedora Python maintainer who saw your email on the python-dev list and realized that this also affects Fedora because we have updated as well and I've already been hit by that.)

[hroncok]

I've applied this patch to Python 3.9.1 in Fedora Rawhide. This fixes the problem.

Before:

Python 3.9.1 (default, Jan 27 2021, 00:00:00) 
[GCC 11.0.0 20210123 (Red Hat 11.0.0-0)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 1+2
3+4
5+6
  File "<stdin>", line 1
    1+2
3+4
5+6

       ^
SyntaxError: multiple statements found while compiling a single statement

After:

Python 3.9.1 (default, Jan 27 2021, 00:00:00) 
[GCC 11.0.0 20210210 (Red Hat 11.0.0-0)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 1+2
3
>>> 3+4
7
>>> 5+6
11
>>> 

[dtrodrigues]

The setting needs to be disabled after each call to rl_read_init_file in case a user manually has enabled bracketed paste within their inputrc file.

One is for when read_init_file is called from Python and the other is part of the module initialization.

[hroncok]

The changelog entry could explain why is this needed a bit. Otherwise looks good to me, it fixes the problem. Thanks!

[vstinner]

minor formatting remarks, apart of that it LGTM

[vstinner]

LGTM. @hroncok: do you want to review the updated PR?

[hroncok]

Nope, I'm good. Thanks

[hroncok]

Label it with the backport labels for miss Islington maybe?

[miss-islington]

Thanks @dtrodrigues for the PR, and @vstinner for merging it 🌮🎉.. I'm working now to backport this PR to: 3.9.
🐍🍒⛏🤖

[miss-islington]

Thanks @dtrodrigues for the PR, and @vstinner for merging it 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖

[bedevere-bot]

GH-24545 is a backport of this pull request to the 3.9 branch.

[bedevere-bot]

GH-24546 is a backport of this pull request to the 3.8 branch.

[vstinner]

Thanks @dtrodrigues! I merged your PR and I'm backporting it to 3.8 and 3.9 branches.