8371183: RichTextModel: ContentChange.isEdit incorrect undoing style modification

[andy-goryachev-oracle]

Fixes an issue found by an external user:

Undoing a style only change fires a change event where ContentChange.isEdit is true when it should be false.

NOTE

• this PR depends on 8366201: RichTextArea: remove allowUndo parameter #1941

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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-8371183: RichTextModel: ContentChange.isEdit incorrect undoing style modification (Enhancement - P4)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jfx.git pull/1961/head:pull/1961
$ git checkout pull/1961

Update a local copy of the PR:
$ git checkout pull/1961
$ git pull https://git.openjdk.org/jfx.git pull/1961/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1961

View PR using the GUI difftool:
$ git pr show -t 1961

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jfx/pull/1961.diff

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[openjdk]

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