Improve handling of undo/redo events in web demo (#1254) #1255
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Fixes #1254. In the demo on https://jsonnet.org, if you hit redo/undo for multiple characters, the demo breaks. This seems to be because the browser generates multiple text change events (Chrome 139, MacOS 14.6).
Previous Behavior
https://jsonnet.org/
Screen.Recording.2025-09-02.at.8.12.12.PM.mov
New Behavior
Screen.Recording.2025-09-02.at.8.12.43.PM.mov