Always start off painting two frames to allow things to settle

egui/src/context.rs

@@ -76,7 +76,12 @@ impl Clone for Context {
 
 impl Context {
     pub fn new() -> Arc<Self> {
-        Arc::new(Self::default())
+        Arc::new(Self {
+            // Start with painting an extra frame to compensate for some widgets
+            // that take two frames before they "settle":
+            repaint_requests: AtomicU32::new(1),
+            ..Self::default()
+        })
     }
 
     /// How much space is still available after panels has been added.

egui/src/demos/app.rs

@@ -60,6 +60,7 @@ impl Default for FrameHistory {
 }
 
 impl FrameHistory {
+    // Called first
     pub fn on_new_frame(&mut self, now: f64, previus_frame_time: Option<f32>) {
         let previus_frame_time = previus_frame_time.unwrap_or_default();
         if let Some(latest) = self.frame_times.latest_mut() {
@@ -74,7 +75,7 @@ impl FrameHistory {
 
     fn ui(&mut self, ui: &mut Ui) {
         ui.label(format!(
-            "Total frames painted: {}",
+            "Total frames painted (including this one): {}",
             self.frame_times.total_count()
         ));