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guinea on egui: the same router and features, drawn immediately.
The closest relative among the backends is ratatui, not WinUI: egui is
immediate, so a view is not a tree that is kept and diffed - it is drawing
that happens inside one frame and leaves nothing behind. As there, a view
is a [Node]: drawing deferred until someone supplies the [egui::Ui] to
draw into, which is what lets a layout decide where its child goes.
What differs from the terminal is who owns the loop. eframe owns it, the
way the reactor does under WinUI, so [run] hands it over and puts the
frame inside eframe::App::update. And unlike a terminal, egui sleeps when
nothing happens - so work finished on another thread has to wake it, which
is what the dispatcher's request_repaint is for.