8370902: RichTextArea: migrate to new text APIs

[andy-goryachev-oracle]

Updates the RichTextArea code to use the new text layout APIs delivered in https://bugs.openjdk.org/browse/JDK-8341670

Also:

• updates the "demo" model in the RichTextAreaDemoApp to show underline/strikethrough in the presence of TextFlow borders

/reviewers 2

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed (2 reviews required, with at least 1 Reviewer, 1 Author)

Issue

• JDK-8370902: RichTextArea: migrate to new text APIs (Enhancement - P4)

Reviewers

• Michael Strauß (@mstr2 - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jfx.git pull/2012/head:pull/2012
$ git checkout pull/2012

Update a local copy of the PR:
$ git checkout pull/2012
$ git pull https://git.openjdk.org/jfx.git pull/2012/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2012

View PR using the GUI difftool:
$ git pr show -t 2012

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jfx/pull/2012.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back angorya! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

@andy-goryachev-oracle
The total number of required reviews for this PR (including the jcheck configuration and the last /reviewers command) is now set to 2 (with at least 1 Reviewer, 1 Author).

[mlbridge]

Webrevs

• 00: Full (0b842a8b)

[andy-goryachev-oracle]

@Ziad-Mid could you be the second reviewer please?