I found the lambda containing CoroutineScope is un...

# compose

[Ayla]

I found the lambda containing CoroutineScope is unstable as CoroutineScope is unstable,

val scope=rememberCoroutineScope()
Text(text="text", onClick={
    scope.launch{...}  //cause recomposition every time
}

This situation also applies to lambdas containing ViewModel.
but warpping every lambda containing unstable variables with remember{} is inconvenient.
Is there a better way to handle it？

[Loney Chou]

I don't know why these lambdas don't get remembered properly like others. Isn't a compiler-generated remember(coroutineScope) { { coroutineScope.launch { /* ... */ } } } enough?

[eygraber]

@Loney Chou the issue is that the onClick lambda captures the CoroutineScope and gets compiled into a unstable class because it has a CoroutineScope property - https://multithreaded.stitchfix.com/blog/2022/08/05/jetpack-compose-recomposition/#gotcha---unstable-lambdas

[Loney Chou]

I know that, but the fact that we have to wrap CoroutineScope into a @Stable form is quite annoying. And if you say so, then it is of no use to remember that lambda, because its actual type is still unstable, thus causing recomposition as well.

[eygraber]

Remembering it should work since it will then pass the equality check

[Loney Chou]

I don't know why these lambdas don't get remembered properly like others. Isn't a compiler-generated remember(coroutineScope) { { coroutineScope.launch { /* ... */ } } } enough?

Then why? 😇 I mean, if you create another lambda instance, the stability won't magically change, so there's no point to not remember that.