<Swing Dev> RFR: 8266249: javax/swing/JPopupMenu/7156657/bug7156657.java fails on macOS [v4]

[Alexander Zuev]

> Fixed popup position taking into account its offset
> Added a lot of screenshots taking to better understand failures should they happen down the line

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Small fixes

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3844/files
  - new: https://git.openjdk.java.net/jdk/pull/3844/files/3a87c08b..7575b1c9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3844&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3844&range=02-03

  Stats: 6 lines in 1 file changed: 3 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3844.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3844/head:pull/3844

PR: https://git.openjdk.java.net/jdk/pull/3844