Uncontrolled Deck with new React Activity component

[mohadib]

Hello!

I am playing with the new Activity component in React 19.2. I noticed that if I dont control a Deck instance, only supply it an initial view state, every time the Activity is toggled to visible from hidden, the state of the Deck instance is reset. I thought Activity did not unmount hidden components, so I expected the state to not be lost. Any ideas why the state is lost?

Small example app:
https://github.com/mohadib/deck-activity

npm run dev

I have 2 maps and a random div you can toggle between. One map uses an activity, and the other uses css display: none when hidden. The css hiding retains state, the activity does not.

Thanks!

[mohadib]

any ideas on this? thanks.

[chrisgervang]

Thanks for reporting! I'm putting together an issue track React 19 Activity support. The root cause needs further investigation, but in the meantime you can try working around this by using controlled mode with viewState/onViewStateChange instead of initialViewState.

[chrisgervang]

Opened #9983

[mohadib]

thanks!