[jdk11u-dev] RFR: 6176679: Application freezes when copying an animated gif image to the system clipboard

[Lutz Schmidt]

Fx request [11u] 

This is for parity with 11.0.21-oracle. 

Patch applies cleanly except for a copyright year mismatch. 

New test succeeds with patch applied.
Build and test pending (SAP overnight).

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Commit messages:
 - Backport 6c71859ac240c788364169422e726f8f5443bf75

Changes: https://git.openjdk.org/jdk11u-dev/pull/2055/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2055&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6176679
  Stats: 272 lines in 3 files changed: 259 ins; 8 del; 5 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2055.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2055/head:pull/2055

PR: https://git.openjdk.org/jdk11u-dev/pull/2055