[jfx17u] RFR: 8321722: Tab header flickering when dragging slowly other tabs and reordering uncompleted

[Johan Vos]

almost clean Backport (apart from a (c) date change) of
8321722: Tab header flickering when dragging slowly other tabs and reordering uncompleted

Reviewed-by: angorya, mstrauss, kcr

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Commit messages:
 - 8321722: Tab header flickering when dragging slowly other tabs and reordering uncompleted

Changes: https://git.openjdk.org/jfx17u/pull/177/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=177&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321722
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx17u/pull/177.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/177/head:pull/177

PR: https://git.openjdk.org/jfx17u/pull/177