[jdk17u-dev] RFR: 8297923: java.awt.ScrollPane broken after multiple scroll up/down [v2]

[Goetz Lindenmaier]

> This backports 8297923 and its two follow ups.
> All three apply clean, except of a Copyright fix in WScrollPanePeer.java in 8310054.

Goetz Lindenmaier has updated the pull request incrementally with one additional commit since the last revision:

  Add forgotten tests

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Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/1578/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/1578/files/8665859f..8283d176

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1578&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1578&range=00-01

  Stats: 284 lines in 2 files changed: 284 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1578.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1578/head:pull/1578

PR: https://git.openjdk.org/jdk17u-dev/pull/1578