How will dialog and popup window work? They need own Window, will this window be managed by Compose, or we need to use framework's Dialog and PopupWindow and create Compose into its content view?

compose dialogs will appeal to the windowmanager under the hood

All changed 🙂 But good old

Activity

hopefully remains.

as does WindowManager 🙂

There's a DropdownPopup already

There is an usage example of an alert dialog in the sample app, Jetnews. Go and see what happens in the ArticleScreen when you click on the font icon or the heart icon.