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kotlinlang

*Bug?* :ladybug:*:  `BoxWithConstraints` update lag*
Can someone confirm the stange flickering occuring om the content inside the `BoxWithConstraints` and that it's gone wenn replaced by a regular Box? Code in the :thread:

Code:
```import androidx.compose.desktop.Window
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier


fun main() {
    Window {
        var isDarkTheme by remember { mutableStateOf(true) }
        //LocalAppWindow.current.keyboard.setShortcut(Key.T) { isDarkTheme = !isDarkTheme } // For Desktop
        MaterialTheme(if(isDarkTheme) darkColors() else lightColors()) {
            Column(Modifier.fillMaxSize().background(MaterialTheme.colors.background)) {
                Button(onClick = { isDarkTheme = !isDarkTheme }) { Text("Toggle") }
                Box(Modifier.fillMaxWidth().fillMaxHeight(0.5f).background(MaterialTheme.colors.background))
                BoxWithConstraints(Modifier.fillMaxSize()) {
                    Box(Modifier.fillMaxSize().background(MaterialTheme.colors.background))
                }
            }
        }
    }
}```

fyi <@U0KMMQA20> regarding <https://kotlinlang.slack.com/archives/CJLTWPH7S/p1617123543403600>

if it repros for you, it will probably repro for others. I’d file a bug to jetbrains compose specifically about this, unless you can also repro on android

that would be the question. I correctly haven't tested it on Android and would like to know if its a general Compose Bug

would be great :+1:
 I currently have no Android Studio installed and would have to setup the whole thing :sweat_smile:

confirmed, i’m seeing it on android too

thanks a lot :pray:
I will file a issue tomorrow morning

boxwithconstraints flicker.mp4

thanks, post here after and i’ll star it

Issue created :raised_hands:
<https://issuetracker.google.com/184173932>

<@U0KMMQA20> could you tell me the compose version of your android test?

I tried commenting on the issue to note that but i don’t have comment permission apparently