RFR: 8371069: RichTextArea: caret with inline node

[Kevin Rushforth]

On Fri, 14 Nov 2025 00:20:45 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Original bug referred to RichTextArea, however the root cause of the issue is the incorrect computation of the caret shape around an embedded `Node` in the `TextFlow`.

Reviewer: @arapte

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PR Comment: https://git.openjdk.org/jfx/pull/1974#issuecomment-3542069125