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8503a85113
I broke this in https://github.com/emilk/egui/pull/3665 For some reason, when using multiple viewports, the first "clear" doesn't take. I don't have time to investigate further, so I am adding a hack here which: * For single-viewport apps, the clear is done before `App::update` so user can paint there * For multi-viewport apps, the clear is done after `App::update`, so that it works This means painting in `App::update` won't work with multi-viewports. Ideally, users should use paint callbacks instead of painting directly in `App::update` anyways.