@Composable
fun PopupInPopup() {
    var visible by remember { mutableStateOf(false) }
    var text by remember { mutableStateOf("") }

    Button(onClick = { visible = true }) {
        Text("Show popup")
    }

    if (visible) {
        Popup(
            onDismissRequest = { visible = true },
            properties = PopupProperties(
                focusable = true
            )
        ) {
            Surface {
                TextField(
                    value = text,
                    onValueChange = { text = it },
                )
            }
        }
    }
}

2022-01-28 10:16:43.902 23575-23575/com.example.popupinpopup E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.popupinpopup, PID: 23575
    java.lang.NullPointerException: view.startActionMode(
      …           type
            ) must not be null
        at androidx.compose.ui.platform.TextToolbarHelperMethods.startActionMode(AndroidTextToolbar.android.kt:89)
        at androidx.compose.ui.platform.AndroidTextToolbar.showMenu(AndroidTextToolbar.android.kt:53)
        at androidx.compose.foundation.text.selection.TextFieldSelectionManager.showSelectionToolbar$foundation_release(TextFieldSelectionManager.kt:596)
        at androidx.compose.foundation.text.CoreTextFieldKt.SelectionToolbarAndHandles(CoreTextField.kt:840)
        at androidx.compose.foundation.text.CoreTextFieldKt.access$SelectionToolbarAndHandles(CoreTextField.kt:1)
        at androidx.compose.foundation.text.CoreTextFieldKt$CoreTextField$4$1$1.invoke(CoreTextField.kt:565)
        at androidx.compose.foundation.text.CoreTextFieldKt$CoreTextField$4$1$1.invoke(CoreTextField.kt:527)
        at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
        at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
        at androidx.compose.foundation.text.selection.SimpleLayoutKt.SimpleLayout(SimpleLayout.kt:79)
        at androidx.compose.foundation.text.CoreTextFieldKt$CoreTextField$4$1.invoke(CoreTextField.kt:527)
        at androidx.compose.foundation.text.CoreTextFieldKt$CoreTextField$4$1.invoke(CoreTextField.kt:510)
        at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
        at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
        at androidx.compose.runtime.RecomposeScopeImpl.compose(RecomposeScopeImpl.kt:142)
        at androidx.compose.runtime.ComposerImpl.recomposeToGroupEnd(Composer.kt:2158)
        at androidx.compose.runtime.ComposerImpl.skipToGroupEnd(Composer.kt:2436)
        at androidx.compose.material.TextFieldKt.IconsWithTextFieldLayout-SxpAMN0(TextField.kt:448)
        at androidx.compose.material.TextFieldKt.access$IconsWithTextFieldLayout-SxpAMN0(TextField.kt:1)
        at androidx.compose.material.TextFieldKt$TextFieldLayout$1.invoke(TextField.kt:369)
        at androidx.compose.material.TextFieldKt$TextFieldLayout$1.invoke(TextField.kt:367)
        at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:116)
        at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
        at androidx.compose.foundation.text.CoreTextFieldKt.CoreTextField(CoreTextField.kt:510)
        at androidx.compose.foundation.text.BasicTextFieldKt.BasicTextField(BasicTextField.kt:262)
        at androidx.compose.material.TextFieldKt.TextFieldLayout-uBqXD2s(TextField.kt:347)
        at androidx.compose.material.TextFieldImplKt$TextFieldImpl$3.invoke-h1eT-Ww(TextFieldImpl.kt:178)
        at androidx.compose.material.TextFieldImplKt$TextFieldImpl$3.invoke(TextFieldImpl.kt:129)
        at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:214)
        at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
        at androidx.compose.material.TextFieldTransitionScope.Transition-DTcfvLk(TextFieldImpl.kt:357)
        at androidx.compose.material.TextFieldImplKt.TextFieldImpl(TextFieldImpl.kt:119)
        at androidx.compose.material.TextFieldKt.TextField(TextField.kt:295)
        at androidx.compose.material.TextFieldKt.TextField(TextField.kt:180)
        at androidx.compose.material.TextFieldKt$TextField$3.invoke(Unknown Source:66)
        at androidx.compose.material.TextFieldKt$TextField$3.invoke(Unknown Source:10)
        at androidx.compose.runtime.RecomposeScopeImpl.compose(RecomposeScopeImpl.kt:142)
        at androidx.compose.runtime.ComposerImpl.recomposeToGroupEnd(Composer.kt:2158)
        at androidx.compose.runtime.ComposerImpl.skipCurrentGroup(Composer.kt:2413)
        at androidx.compose.runtime.ComposerImpl$doCompose$2$5.invoke(Composer.kt:2594)
        at androidx.compose.runtime.ComposerImpl$doCompose$2$5.invoke(Composer.kt:2580)

+ ViewRootImpl
\--+ PopupLayout
   \--- AndroidComposeView

+ ViewRootImpl
\--+ DecorView
   \--+ ...
      \--+ ContentFrameLayout
         \--+ ComposeView
            \--- AndroidComposeView

startActionModeForChild()

DecorView

DecorView

TextToolbar

DecorView

WindowManager.LayoutParams

ViewGroup.LayoutParams

LocalView.current

PopupLayout

/**
 * Opens a popup with the given content.
 * The popup is visible as long as it is part of the composition hierarchy.
 *
 * Note: This is highly reduced version of the official Popup composable with some changes:
 * * Fixes an issue with action mode (copy-paste) menu, see <https://issuetracker.google.com/issues/216662636>
 * * Adds the view to the decor view of the window, instead of the window itself.
 * * Do not have properties, as Popup is laid out as fullscreen.
 *
 * @param onDismissRequest Executes when the user clicks outside of the popup.
 * @param content The content to be displayed inside the popup.
 */
@Composable
fun FullScreenPopup(
    onDismissRequest: (() -> Unit)? = null,
    content: @Composable () -> Unit
) {
    val view = LocalView.current
    val parentComposition = rememberCompositionContext()
    val currentContent by rememberUpdatedState(content)
    val popupId = rememberSaveable { UUID.randomUUID() }
    val popupLayout = remember {
        PopupLayout(
            onDismissRequest = onDismissRequest,
            composeView = view,
            popupId = popupId
        ).apply {
            setContent(parentComposition) {
                Box(Modifier.semantics { this.popup() }) {
                    currentContent()
                }
            }
        }
    }

    DisposableEffect(popupLayout) {
        popupLayout.show()
        popupLayout.updateParameters(
            onDismissRequest = onDismissRequest
        )
        onDispose {
            popupLayout.disposeComposition()
            // Remove the window
            popupLayout.dismiss()
        }
    }

    SideEffect {
        popupLayout.updateParameters(
            onDismissRequest = onDismissRequest
        )
    }
}

/**
 * The layout the popup uses to display its content.
 */
@SuppressLint("ViewConstructor")
internal class PopupLayout(
    private var onDismissRequest: (() -> Unit)?,
    composeView: View,
    popupId: UUID
) : AbstractComposeView(composeView.context),
    ViewRootForInspector {

    private val decorView = findOwner<Activity>(composeView.context)?.window?.decorView as ViewGroup

    override val subCompositionView: AbstractComposeView get() = this

    init {
        id = android.R.id.content
        ViewTreeLifecycleOwner.set(this, ViewTreeLifecycleOwner.get(composeView))
        ViewTreeViewModelStoreOwner.set(this, ViewTreeViewModelStoreOwner.get(composeView))
        ViewTreeSavedStateRegistryOwner.set(this, ViewTreeSavedStateRegistryOwner.get(composeView))
        // Set unique id for AbstractComposeView. This allows state restoration for the state
        // defined inside the Popup via rememberSaveable()
        setTag(R.id.compose_view_saveable_id_tag, "Popup:$popupId")
    }

    private var content: @Composable () -> Unit by mutableStateOf({})

    override var shouldCreateCompositionOnAttachedToWindow: Boolean = false
        private set

    fun show() {
        decorView.addView(this, MarginLayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT))

        requestFocus()
    }

    fun setContent(parent: CompositionContext, content: @Composable () -> Unit) {
        setParentCompositionContext(parent)
        this.content = content
        shouldCreateCompositionOnAttachedToWindow = true
    }

    @Composable
    override fun Content() {
        content()
    }

    /**
     * Taken from PopupWindow
     */
    override fun dispatchKeyEvent(event: KeyEvent): Boolean {
        if (event.keyCode == KeyEvent.KEYCODE_BACK) {
            if (keyDispatcherState == null) {
                return super.dispatchKeyEvent(event)
            }
            if (event.action == KeyEvent.ACTION_DOWN && event.repeatCount == 0) {
                val state = keyDispatcherState
                state?.startTracking(event, this)
                return true
            } else if (event.action == KeyEvent.ACTION_UP) {
                val state = keyDispatcherState
                if (state != null && state.isTracking(event) && !event.isCanceled) {
                    onDismissRequest?.invoke()
                    return true
                }
            }
        }
        return super.dispatchKeyEvent(event)
    }

    fun updateParameters(
        onDismissRequest: (() -> Unit)?
    ) {
        this.onDismissRequest = onDismissRequest
    }

    fun dismiss() {
        ViewTreeLifecycleOwner.set(this, null)
        decorView.removeView(this)
    }
}

private inline fun <reified T> findOwner(context: Context): T? {
    var innerContext = context
    while (innerContext is ContextWrapper) {
        if (innerContext is T) {
            return innerContext
        }
        innerContext = innerContext.baseContext
    }
    return null
}