RFR: 8307779: Relax the java.awt.Robot specification [v2]

[Alexander Zvegintsev]

> We need to relax the java.awt.Robot specification according to the latest operating system trends. 
> This should at least cover the case of Wayland, which has changed many familiar concepts in Linux.
> 
> https://bugs.openjdk.org/browse/JDK-8280982 [Wayland] [XWayland] java.awt.Robot taking screenshots
> https://bugs.openjdk.org/browse/JDK-8280995 [XWayland] Robot.mouseMove does not visually move mouse cursor
> https://bugs.openjdk.org/browse/JDK-8280990 [XWayland] XTest emulated mouse click does not bring window to front.
> https://bugs.openjdk.org/browse/JDK-8280988 [XWayland] Click on title to request focus test failures

Alexander Zvegintsev has updated the pull request incrementally with two additional commits since the last revision:

 - rephrase wording about mouse pointer may not visually move
 - Remove mention of mouse cursor for screen capture

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13809/files
  - new: https://git.openjdk.org/jdk/pull/13809/files/4bbf519f..548d1824

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13809&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13809&range=00-01

  Stats: 7 lines in 1 file changed: 1 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/13809.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13809/head:pull/13809

PR: https://git.openjdk.org/jdk/pull/13809