Configuring RawInput::predicted_dt to 0?

[barries]

We're using ctx.request_repaint_after() to schedule an update, but have found a very surprising behavior where egui doesn't wait as long as requested, resulting in premature callbacks, causing many surprising unnecessary updates. For now, we've hacked a workaround (see below) by setting RawInput::predicted_dt to 0 in raw_input_hook().

Is there a way to disable it, rather than work around it?

Separately, is the behavior documented anywhere?

Also, should this be disabled in reactive mode (and maybe in continuous mode--it's pretty likely to not guess right and cause extra repaints, IIUC)?

Thanks!

impl eframe::App for IotasoftUiApp {                                                    
    fn raw_input_hook(&mut self, _ctx: &egui::Context, raw_input: &mut egui::RawInput) {
        raw_input.predicted_dt = 0.0; // work around undocumented request_repaint_after() behavior that silently causes premature updates
    }                                                                                   
                                                                                        
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {             
        self.manage_polling();  // polls hardware, then sets self.next_poll_time
                                                                                        
        ... rendering code ...
                                                                                        
        let now = Instant::now();                                                       
        if now >= self.next_poll_time {                                                                                     
            self.ctx.request_repaint();                                                 
        } else {                                                                        
            let poll_remaining_time = self.next_poll_time - now;                                                  
            self.ctx.request_repaint_after(poll_remaining_time);                        
        }                                                                               
    }                                                                                   
}