8356042: RichTextArea: tab stops attributes

[andy-goryachev-oracle]

• adds tab stops paragraph attributes to the RichTextArea
• adds a ruler to the RichEditorDemoApp

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Progress

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

Issue

• JDK-8356042: RichTextArea: tab stops attributes (Enhancement - P4)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jfx.git pull/1800/head:pull/1800
$ git checkout pull/1800

Update a local copy of the PR:
$ git checkout pull/1800
$ git pull https://git.openjdk.org/jfx.git pull/1800/head

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$ git pr checkout 1800

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$ git pr show -t 1800

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https://git.openjdk.org/jfx/pull/1800.diff

[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.

[Maran23]

If this immutable, why not use a record instead?

[andy-goryachev-oracle]

good question!

I see no value here in making it a record, and I think there is a possibility for an application to extend TabStop in order to provide additional attributes.

[andy-goryachev-oracle]

(this thing is still in Draft, but thank you for checking up on it!)

[openjdk]

⚠️ @andy-goryachev-oracle This pull request contains merges that bring in commits not present in the target repository. Since this is not a "merge style" pull request, these changes will be squashed when this pull request in integrated. If this is your intention, then please ignore this message. If you want to preserve the commit structure, you must change the title of this pull request to Merge <project>:<branch> where <project> is the name of another project in the OpenJDK organization (for example Merge jdk:master).