HomeListItem5.kt

var deleteMode by remember { mutableStateOf(false) }
if (editMode && !deleteMode) {
   Button(
       onClick = {
           deleteMode = !deleteMode
       }, modifier = Modifier
           .width(deleteButtonWidth)
           .fillMaxHeight(),
       shape = RoundedCornerShape(noRadius),
       colors = ButtonDefaults.outlinedButtonColors(
           contentColor = Color.Red,
           backgroundColor = scColors.primary
       )
   ) {
       Icon(
           imageVector = Icons.Filled.DeleteForever,
           contentDescription = "delete",
           modifier = Modifier
               .align(Alignment.CenterVertically)
       )
   }
}

I might be doing something wrong, but on the first line I get an error:
Type TypeVariable(T) has no method getValue(Nothing?, KProperty<*>) and thus it cannot serve as a delegate
Changing the by to a = solve the error, but I'm still trying to understand the code.

To use the by operator you have to import runtime.setValue

import androidx.compose.runtime.setValue

Ok, I see now.