RFR: 8352268: RichEditorDemo: Save file doesn't always save

[Kevin Rushforth]

On Tue, 18 Mar 2025 20:43:10 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Fixes embarrassing bugs in Rich Editor Demo:
> 
> - File -> Save not saving
> - File -> Open not emphasizing .rich files

Looks good. I tried the work flow that failed for me earlier and it now works.

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Marked as reviewed by kcr (Lead).

PR Review: https://git.openjdk.org/jfx/pull/1739#pullrequestreview-2700023869