[jdk20] RFR: 8298425: System.console().readLine() hangs in jshell [v2]

[Jan Lahoda]

> After https://bugs.openjdk.org/browse/JDK-8295803, JShell snippets like:
> 
> jshell> System.console().readLine()
> 
> 
> hang, as the JLine console is used, and it cannot correctly read from the console while in the remote agent (due to input/output redirection setup for the agent). Until [JDK-8296454](https://bugs.openjdk.org/browse/JDK-8296454) is resolved, the JLine console should be disabled inside the remote agent.
> 
> As the default console requires an attached terminal, and there is no attached terminal inside the agent, `System.console()` should then return `null` inside the JShell's agent, which was the behavior before JDK-8295803.

Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:

  Set the jdk.console property on command line.

-------------

Changes:
  - all: https://git.openjdk.org/jdk20/pull/11/files
  - new: https://git.openjdk.org/jdk20/pull/11/files/2404e4e2..e4f32a5a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk20&pr=11&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk20&pr=11&range=00-01

  Stats: 9 lines in 2 files changed: 6 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk20/pull/11.diff
  Fetch: git fetch https://git.openjdk.org/jdk20 pull/11/head:pull/11

PR: https://git.openjdk.org/jdk20/pull/11