RFR: 8373193: RichTextArea: exceptions specifying position beyond the document end

[Lukasz Kostyra]

On Mon, 8 Dec 2025 20:38:48 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Tying loose ends: clamping start/end positions in the `StyledTextModel` mutation operations to avoid problems down the road.

LGTM, a quick test run and manual check works fine

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Marked as reviewed by lkostyra (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/2001#pullrequestreview-3567169936