Hiding the main program window/handling on_close with the new API

[4JX]

Updating my app to work with 0.25.0 and I noticed the removal of the on_close_event (using eframe).

I've tried calling ctx.send_viewport_cmd(ViewportCommand::Visible(false)); which I assumed would be the equivalent of frame.set_visible(false); but it doesn't seem to do anything.

Similarly for converting from on_close to the new API this prevents the window from being closed but doesn't hide the window afterwards

if ctx.input(|i| i.viewport().close_requested()) {
    ctx.send_viewport_cmd(ViewportCommand::CancelClose);
    ctx.send_viewport_cmd(ViewportCommand::Visible(false));
}

What am I missing here?

[Wicpar]

it works on windows for me, but it doesn't seem possible to show again,

  ctx.send_viewport_cmd(egui::ViewportCommand::Visible(true));

is never consumed

[izolyomi]

I've just encountered this with egui 0.31.1 on Windows 10. On my system, handling

ctx.send_viewport_cmd(egui::ViewportCommand::Visible(false));

works just fine, but setting it back to true again is just always ignored, so the window is never shown again.
Is there a known and reasonable workaround without platform-specific calls?

[lifei]

Long story, see this #3655