RFR: 8230833: LabeledSkinBase computes wrong height with ContentDisplay.GRAPHIC_ONLY [v3]

[Karthik P K]

> Ignore text condition was not considered in `computePrefHeight` method while calculating the Label height.
> 
> Added `isIgnoreText` condition in `computePrefHeight` method while calculating Label height.
> 
> Tests are present for all the ContentDisplay types. Modified tests which were failing because of the new height value getting calculated.

Karthik P K has updated the pull request incrementally with one additional commit since the last revision:

  Code optimization

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Changes:
  - all: https://git.openjdk.org/jfx/pull/996/files
  - new: https://git.openjdk.org/jfx/pull/996/files/c2a2afa6..1d20f756

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=996&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=996&range=01-02

  Stats: 55 lines in 1 file changed: 21 ins; 23 del; 11 mod
  Patch: https://git.openjdk.org/jfx/pull/996.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/996/head:pull/996

PR: https://git.openjdk.org/jfx/pull/996