RFR: 8321970: New table columns don't appear when using fixed cell size unless refreshing tableView [v2]

[Jose Pereda]

> This PR fixes an issue when a new `TableColumn` is added to a `TableView` control with fixed cell size set, where the `TableRowSkinBase` failed to add the cells for the new column.
> 
> A test is included that fails before applying this PR and passes with it.

Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:

  address feedback

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1308/files
  - new: https://git.openjdk.org/jfx/pull/1308/files/9c138c49..04cc76b4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1308&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1308&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1308.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1308/head:pull/1308

PR: https://git.openjdk.org/jfx/pull/1308