[jdk21u-dev] RFR: 8309621: [XWayland][Screencast] screen capture failure with sun.java2d.uiScale other than 1

[Martin Doerr]

Clean backport of [JDK-8309621](https://bugs.openjdk.org/browse/JDK-8309621).

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Commit messages:
 - Backport 387896fb349f341081c6075fb7169e9f3a0919cd

Changes: https://git.openjdk.org/jdk21u-dev/pull/762/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=762&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309621
  Stats: 236 lines in 8 files changed: 168 ins; 48 del; 20 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/762.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/762/head:pull/762

PR: https://git.openjdk.org/jdk21u-dev/pull/762