RFR: 8293444: Creating ScrollPane with same content component causes memory leak [v2]

[Andy Goryachev]

> Using Weak*Listeners eliminates the memory leak.

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  8293444: memory buddy

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Changes:
  - all: https://git.openjdk.org/jfx/pull/900/files
  - new: https://git.openjdk.org/jfx/pull/900/files/b6316bbb..02330d09

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=900&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=900&range=00-01

  Stats: 20 lines in 1 file changed: 1 ins; 18 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/900.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/900/head:pull/900

PR: https://git.openjdk.org/jfx/pull/900