[jdk17u-dev] RFR: 8309621: [XWayland][Screencast] screen capture failure with sun.java2d.uiScale other than 1

[Matthias Baesken]

Backport of 8309621, the modified test ScreenCaptureGtkTest.java is not in 17, otherwise clean backport

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Commit messages:
 - Backport 387896fb349f341081c6075fb7169e9f3a0919cd

Changes: https://git.openjdk.org/jdk17u-dev/pull/2725/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2725&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309621
  Stats: 228 lines in 7 files changed: 162 ins; 47 del; 19 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2725.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2725/head:pull/2725

PR: https://git.openjdk.org/jdk17u-dev/pull/2725