RFR: 8261221: Tooltip bigger than screen size blinks - shows and hides over and over again [v3]

[Paweł Kruszczyński]

> `Tooltip` is no longer hiding upon receiving `MouseEvent.MOUSE_ENTERED_TARGET` event inside it. Pressing mouse on overlaying tooltip also kills the tooltip, so the infinite duration tooltip can be closed.

Paweł Kruszczyński has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'openjdk:master' into 8261221_tooltip_blinks
 - 8261221: Tooltip bigger than screen size blinks - applying reviewed fixes
 - 8261221: Tooltip bigger than screen size blinks - shows and hides over and over again

-------------

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/395/files
  - new: https://git.openjdk.java.net/jfx/pull/395/files/3fb62625..0a175dca

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=395&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=395&range=01-02

  Stats: 954937 lines in 11930 files changed: 523481 ins; 281758 del; 149698 mod
  Patch: https://git.openjdk.java.net/jfx/pull/395.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/395/head:pull/395

PR: https://git.openjdk.java.net/jfx/pull/395