Lint vertical spacing in the code (#3224)

* Lint vertical spacing in the code

* Add some vertical spacing for readability

crates/eframe/src/lib.rs

@@ -272,6 +272,7 @@ pub fn run_simple_native(
     struct SimpleApp<U> {
         update_fun: U,
     }
+
     impl<U: FnMut(&egui::Context, &mut Frame)> App for SimpleApp<U> {
         fn update(&mut self, ctx: &egui::Context, frame: &mut Frame) {
             (self.update_fun)(ctx, frame);

crates/eframe/src/native/epi_integration.rs

@@ -335,8 +335,10 @@ pub struct EpiIntegration {
     pub egui_ctx: egui::Context,
     pending_full_output: egui::FullOutput,
     egui_winit: egui_winit::State,
+
     /// When set, it is time to close the native window.
     close: bool,
+
     can_drag_window: bool,
     window_state: WindowState,
     follow_system_theme: bool,

crates/eframe/src/native/run.rs

@@ -22,6 +22,7 @@ use super::epi_integration::{self, EpiIntegration};
 pub enum UserEvent {
     RequestRepaint {
         when: Instant,
+
         /// What the frame number was when the repaint was _requested_.
         frame_nr: u64,
     },