Kotlin coroutine scope associated with an Android View (scope cancelled on view detached and re-initialized in case it's re-attached)

CoroutineScopes.kt

import android.view.View
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.SupervisorJob
import kotlinx.coroutines.cancel

val View.viewCoroutineScope: CoroutineScope
    get() {
        var viewScope = getTag(R.id.viewCoroutineScope) as CoroutineScope?

        if (viewScope == null) {
            val scope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
            addOnAttachStateChangeListener(object : View.OnAttachStateChangeListener {
                override fun onViewDetachedFromWindow(v: View?) {
                    setTag(R.id.viewCoroutineScope, null)
                    scope.cancel()
                }

                override fun onViewAttachedToWindow(v: View?) {
                    /* no-op */
                }
            })
            setTag(R.id.viewCoroutineScope, scope)
            viewScope = scope
        }

        return viewScope
    }

tags.xml

<!-- res/values/tags.xml -->
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item type="id" name="viewCoroutineScope" />
</resources>