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m-sasha avatar m-sasha commented on May 27, 2024

This doesn't actually have anything to do with the DateRangePicker, but with recompositions in a newly created Composition where a state was created and written into immediately.

Reproducer:

class RecompositionBug {

    @OptIn(ExperimentalTestApi::class, InternalComposeApi::class)
    @Test
    fun test() = runComposeUiTest {
        var lastRecomposedValue = 0
        lateinit var rootNode: LayoutNode
        var useInnerComposition by mutableStateOf(false)

        setContent {
            if (useInnerComposition) {
                val compositionContext = currentComposer.buildContext()
                remember {
                    val composition = Composition(DefaultUiApplier(rootNode), compositionContext)
                    composition.setContent {
                        var value by remember {
                            mutableStateOf(0)
                                .also {
                                    it.value = 1
                                }
                        }
                        Column {
                            lastRecomposedValue = value
                            Text("Value = $value")
                            LaunchedEffect(Unit) {
                                delay(1000)
                                value = 2
                            }
                        }
                    }
                }
            }
        }

        rootNode = onRoot().fetchSemanticsNode().layoutNode

        useInnerComposition = true
        waitForIdle()
        assertEquals(2, lastRecomposedValue)
    }

}

from compose-multiplatform.

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