RFR: 8189282: JavaFX: Invalid position of candidate pop-up of InputMethod in Hi-DPI on Windows

[Martin Fox]

When reporting input method candidate position the code in GlassViewEventHandler is not applying the platform scale factors. This is causing incorrect IM positions to be reported to glass on hi-dpi monitors.

This PR a no-op on Mac since the platform scale factors are always 1.0. I don't think it affects the current Linux XIM code at all but XIM is so out-of-date it has become difficult to test. PR #1080 will replace the old XIM code and needs this fix to work properly on hi-dpi screens.

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Commit messages:
 - Removed debug output
 - Applying screen scale factors when positioning IM window

Changes: https://git.openjdk.org/jfx/pull/1311/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1311&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8189282
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1311.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1311/head:pull/1311

PR: https://git.openjdk.org/jfx/pull/1311