RFR: 8371183: RichTextModel: ContentChange.isEdit incorrect undoing style modification [v2]

[Lukasz Kostyra]

On Mon, 10 Nov 2025 19:49:19 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> 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 #1941 (resolved)
>
> Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   bad merge

LGTM. I verified the test on Windows and playing around a short bit with Rich Editor, everything works fine.

Despite ~60 lines changed, this change is trivial (adding an extra flag and acting upon it in one place) and IMHO does not need a second reveiwer.

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Marked as reviewed by lkostyra (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1961#pullrequestreview-3448023601