RFR: JDK-8298060: Fix precision bug in gesture recognizer classes

Mon Dec 5 12:47:38 UTC 2022

This includes a fix for the precision problem we've found as part of the graphics warnings clean ups.

I've included two commits, one with just the minimal fix, and one with the clean ups. I can drop off the 2nd commit if it is deemed to be of no added value.

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Commit messages:
 - General clean ups
 - Fix precision problems in gesture recognizers

Changes: https://git.openjdk.org/jfx/pull/966/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=966&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298060
  Stats: 206 lines in 4 files changed: 35 ins; 47 del; 124 mod
  Patch: https://git.openjdk.org/jfx/pull/966.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/966/head:pull/966

PR: https://git.openjdk.org/jfx/pull/966