RFR: 8307165: java/awt/dnd/NoFormatsDropTest/NoFormatsDropTest.java timed out [v4]

[Damon Nguyen]

> When converting this test to be applicable to be open sourced, changes were made. I reverted some of these changes to get the test stable again. Now it passes when run on various OS's 100x.

Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:

  Make panels volatile. Move waitForIdle

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13761/files
  - new: https://git.openjdk.org/jdk/pull/13761/files/34c649b0..5af93fcd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13761&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13761&range=02-03

  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13761.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13761/head:pull/13761

PR: https://git.openjdk.org/jdk/pull/13761