sbt.internal.util.Terminal.proxyInputStream does not override available

[steinybot]

steps

1. Add site-sbt to a project.
2. Run previewAuto.
3. Press any key.

Reproduction here: https://github.com/steinybot/bug-reports/tree/sbt/terminal-is-available

problem

It does not stop.

expectation

It should stop.

notes

sbt/sbt-site#168

unfiltered.util.RunnableServer has a busy loop polling for System.in.available() to be > 0 but it never is. This is because sbt.internal.util.Terminal.proxyInputStream does not override available but it should.

[eed3si9n]

Thanks for the report!
Here's my PR for this - #6965