RFR: 8251480: TableColumnHeader: calc of cell width must respect row styling

Wed Mar 16 08:27:15 UTC 2022

This fix respects a row factory, if present.
It will put the cell that is used to measure the column width as child below the row.
In that way the row's style will be used.

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Commit messages:
 - 8251480: TableColumnHeader: calc of cell width must respect row styling

Changes: https://git.openjdk.java.net/jfx/pull/757/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=757&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251480
  Stats: 38 lines in 2 files changed: 34 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jfx/pull/757.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/757/head:pull/757

PR: https://git.openjdk.java.net/jfx/pull/757