RFR: 8162380: [TEST_BUG] MouseEvent/.../AltGraphModifierTest.java has only "Fail" button [v3]

[Prasanta Sadhukhan]

> Test was made to fail due to presence of only "Fail" button instead of both "Pass" and "Fail".
> 
> Modified the test to use PFJ and also clarified the instruction for Windows and Linux

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

  Test update

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27162/files
  - new: https://git.openjdk.org/jdk/pull/27162/files/87957dbb..4ae6f962

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27162&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27162&range=01-02

  Stats: 8 lines in 1 file changed: 2 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/27162.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27162/head:pull/27162

PR: https://git.openjdk.org/jdk/pull/27162