RFR: 8366201: RichTextArea: remove allowUndo parameter [v6]

[Andy Goryachev]

On Thu, 30 Oct 2025 17:39:18 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Original user feedback (see https://mail.openjdk.org/pipermail/openjfx-discuss/2025-August/000267.html ) called for adding an `allowUndo` parameter to `applyStyle()` and `setStyle()` methods similarly to `replaceText()`.
>> 
>> Upon further analysis, the `allowUndo` parameter was a mistake: allowing the application code to disable creating undo/redo entries messes up the internal undo/redo stack.
>> There is an internal need (`UndoableChange`), but it should not be exposed via public API.
>> 
>> This PR also adds `isUndoRedoEnabled()` and `setUndoRedoEnabled()` to the `StyledTextModel`, as well as its forwarding aliases to `RichTextArea` to allow for the application to disable undo/redo temporarily, for example, when building a document from multiple segments.
>> 
>> WARNING this is an incompatible change, permitted because of the incubator.
>> 
>> There remains a possible issue with currently unlimited size of the undo/redo stack - perhaps we should limit its depth to maybe 100-200 entries, see https://bugs.openjdk.org/browse/JDK-8370447 .
>
> Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   javadoc

I wonder if it might be better to remove these notes from all the editing methods in the control (since all of them call the model), and keep the notes in the model.

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PR Comment: https://git.openjdk.org/jfx/pull/1941#issuecomment-3470491866