M.measured {}

IntSize.kt

import androidx.compose.ui.unit.Density
import androidx.compose.ui.unit.DpSize
import androidx.compose.ui.unit.IntSize

fun IntSize.toDp(density: Density): DpSize = with(density) { DpSize(width = width.toDp(), height = height.toDp()) }

Modifier.kt

import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.layout.onPlaced
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.unit.DpSize
import dev.bmcreations.leftovers.utils.toDp

fun Modifier.measured(block: (DpSize) -> Unit): Modifier = composed {
    val density = LocalDensity.current
    onPlaced { block(it.size.toDp(density)) }
}