eugene yokota 67924298f2 [2.x] fix: Fixes sbtn stdin race condition (#9521)
**Problem**
There's a race condition between per-byte readSystemIn notification
and one-byte-read thread lifecycle.

Note: One-byte-read thread was introduced as a solution to the problem
that switching the terminal between raw and canonical mode cannot happen
if it's blocked by read.

**Solution**
This eliminates the thread lifecycle issue by keeping the thread alive
throughout the lifecycle of sbtn itself.
read is still called on demand by the server readSystemIn notification.
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sbt

sbt is a build tool for Scala, Java, and more.

For general documentation, see https://www.scala-sbt.org/.

sbt 2.x

This is the 2.x series of sbt. The source code of sbt is split across several GitHub repositories, including this one.

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