The more and less utilities (pagers) break command-line editing on macOS and Linux

Note:

• On macOS 10.14, both more and less produce the symptom, whereas it is only less on Ubuntu 18.04.
• Whether or not the PSReadLine module is loaded makes no difference.

^{It took considerable discipline to refrain from more or less jokes.}

Steps to reproduce

On macOS or Ubuntu, run the following and then press <kbd>q</kbd> to exit the pager:

# On macOS, `more` is affected too.
1..200 | less

Expected behavior

less should exit, the command prompt should return, and command recall with <kbd>arrow up</kbd> should continue to function.

Actual behavior

less exits and the command prompt does return, but command recall is now broken: an A is printed instead.

Environment data

PowerShell Core v7.0.0-preview.3 on macOS 10.14.6
PowerShell Core v7.0.0-preview.3 on Ubuntu 18.04.3 LTS

[rkeithhill]

This has also been reported in the PSReadLine repo - https://github.com/PowerShell/PSReadLine/issues/1007 It is very annoying.

[mklement0]

‘Resolution-External’ will auto closes the issue.

I guess a closed issue is better than none for discoverability, but it would more make sense to me to keep such issues open until the issue is actually resolved (externally).

If a native command is last in a pipeline will it rise the issue too?

more and less become effective no-ops (buffering changes aside) if you don’t use them as the last pipeline segment, so the issue doesn’t arise then - but it’s a useless use case.