[jdk11u-dev] RFR: 8259237: Demo selection changes with left/right arrow key. No need to press space for selection.

[Martin Doerr]

Clean backport of JDK-8259237.

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Commit messages:
 - Backport 28ff2de1860bf70b1174fd434346be750d9dbf01

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/366/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=366&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259237
  Stats: 99 lines in 2 files changed: 92 ins; 1 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/366.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/366/head:pull/366

PR: https://git.openjdk.java.net/jdk11u-dev/pull/366