RFR: 8041447: Test javax/swing/dnd/7171812/bug7171812.java fails with java.lang.RuntimeException: Test failed, scroll on drag doesn't work [v2]

[Prasanta Sadhukhan]

> Test probably was failing few years back due to samevm mode.
> It's not failing now but made some robot safeguards.
> Several iterations are passing in all CI platforms. Link in JBS.

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Access swing comp in EDT

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11959/files
  - new: https://git.openjdk.org/jdk/pull/11959/files/5623f4b3..01f13be8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11959&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11959&range=00-01

  Stats: 13 lines in 1 file changed: 6 ins; 2 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/11959.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11959/head:pull/11959

PR: https://git.openjdk.org/jdk/pull/11959