RFR: 8303740 JavaFX - Leak in Logging, Logging remembers last exception [v2]

[Florian Kirmaier]

> When an exception is logged in JavaFX, then the exception is kept in a reference.
> This way, always the last logged exception is retained.
> 
> This is a memory-leak.
> This was done to write unit-tests to ensure certain error-cases are logged.
> 
> A simple fix is, to add a flag, to enable/disable retaining the exception.

Florian Kirmaier has updated the pull request incrementally with one additional commit since the last revision:

  JDK-8303740
  Added changes based on code review

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1053/files
  - new: https://git.openjdk.org/jfx/pull/1053/files/1fe0d464..ad34efb7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1053&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1053&range=00-01

  Stats: 45 lines in 3 files changed: 41 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/1053.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1053/head:pull/1053

PR: https://git.openjdk.org/jfx/pull/1053