RFR: 8304922: [testbug] SliderTooltipNPETest fails on Linux [v3]

[Karthik P K]

> The test was failing on the first run and then it was not failing. Cause for the failure looked to be the UI state not getting updated. Hence added call to `Toolkit` `firePulse` method.
> 
> Able to run the test consistently without failure in Linux after the fix.

Karthik P K has updated the pull request incrementally with one additional commit since the last revision:

  Stabilize test in Linux

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1119/files
  - new: https://git.openjdk.org/jfx/pull/1119/files/1033f258..08d08a7b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1119&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1119&range=01-02

  Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1119.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1119/head:pull/1119

PR: https://git.openjdk.org/jfx/pull/1119