RFR: 8325564: ComboBox popup does not correctly resize after update when on display [v2]

[Ziad El Midaoui]

> Fixed popup size not changing to show more items or less when changing the number of items in `ComboBox` by adding a `popupResize` variable which triggers a request layout when there is change in items list.
> Tested with the test app in bug and MonkeyTester.

Ziad El Midaoui has updated the pull request incrementally with one additional commit since the last revision:

  Removed 'popupResize' flag

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Changes:
  - all: https://git.openjdk.org/jfx/pull/2052/files
  - new: https://git.openjdk.org/jfx/pull/2052/files/cfb00a44..c975fc59

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=2052&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=2052&range=00-01

  Stats: 22 lines in 2 files changed: 4 ins; 12 del; 6 mod
  Patch: https://git.openjdk.org/jfx/pull/2052.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/2052/head:pull/2052

PR: https://git.openjdk.org/jfx/pull/2052