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* `edit.draw(state)` -- call this from `on.draw` to display the current editor
state on the app window as requested in the call to `edit.initialize_state`
that created `state`.
* `edit.draw(state, fg, hide_cursor)` -- call this from `on.draw` to display
the current editor state on the app window as requested in the call to
`edit.initialize_state` that created `state`. `fg` is the color for
foreground text (`Text_color` is a good default). Set `hide_cursor` to stop
showing a blinking cursor (usually because you want a `readonly` editor; see
below).