RFR: 8230833: LabeledSkinBase computes wrong height with ContentDisplay.GRAPHIC_ONLY [v6]

[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:

  Optimizing computePrefWidth method

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Changes:
  - all: https://git.openjdk.org/jfx/pull/996/files
  - new: https://git.openjdk.org/jfx/pull/996/files/ede9c535..ec748e56

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=996&range=05
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=996&range=04-05

  Stats: 26 lines in 1 file changed: 10 ins; 6 del; 10 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