gh-151744: Add curses.nofilter()

[serhiy-storchaka]

The curses module wraps filter() but not its inverse nofilter().

filter() puts curses into single-line mode — it forces LINES to 1 at the next initscr(). nofilter(), an ncurses extension, undoes that effect.

Without it, code (or a test) that calls curses.filter() has no way to restore normal screen sizing for a later initscr() in the same process.

This wraps nofilter() as curses.nofilter(), guarded by a configure check, alongside the existing curses.filter().

• Issue: Add curses.nofilter() #151744

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #33220964 | 📁 Comparing 23f6f39 against main (7d4a0aa)

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3 files changed

± library/curses.html
± whatsnew/3.16.html
± whatsnew/changelog.html

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot wasm32-wasi 3.x (tier-2) has failed when building commit 2e5843e.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1046/builds/12130) and take a look at the build logs.
4. Check if the failure is related to this commit (2e5843e) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1046/builds/12130

Summary of the results of the build (if available):

Click to see traceback logs

remote: Enumerating objects: 22, done.        
remote: Counting objects:  10% (1/10)        
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remote: Counting objects: 100% (10/10), done.        
remote: Compressing objects:  11% (1/9)        
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remote: Compressing objects: 100% (9/9), done.        
remote: Total 22 (delta 1), reused 1 (delta 1), pack-reused 12 (from 1)        
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD
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Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 2e5843e13fc gh-151744: Add curses.nofilter() (GH-151747)
Switched to and reset branch 'main'

⚠️ WARNING: This script is deprecated and slated for removal in Python 3.20; execute the `Platforms/WASI/` directory instead (i.e. `python Platforms/WASI`)


⚠️ WARNING: This script is deprecated and slated for removal in Python 3.20; execute the `Platforms/WASI/` directory instead (i.e. `python Platforms/WASI`)


⚠️ WARNING: This script is deprecated and slated for removal in Python 3.20; execute the `Platforms/WASI/` directory instead (i.e. `python Platforms/WASI`)