eframe error handling (#2433)

* eframe::run_native: return errors instead of crashing

* Detect and handle glutin errors

* egui_demo_app: silence wgpu log spam

* Add trace logs for why eframe is shutting down

* Fix: only save App state once on Mac

* Handle Winit failure

* Log where we load app state from

* Don't panic on zero-sized window

* Clamp loaded window size to not be too tiny to see

* Simplify code: more shared code in window_builder

* Improve code readability

* Fix wasm32 build

* fix android

* Update changelog

crates/egui_demo_app/src/main.rs

@@ -3,7 +3,18 @@
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
 
 // When compiling natively:
-fn main() {
+fn main() -> Result<(), eframe::EframeError> {
+    {
+        // Silence wgpu log spam (https://github.com/gfx-rs/wgpu/issues/3206)
+        let mut rust_log = std::env::var("RUST_LOG").unwrap_or_else(|_| "info".to_owned());
+        for loud_crate in ["naga", "wgpu_core", "wgpu_hal"] {
+            if !rust_log.contains(&format!("{loud_crate}=")) {
+                rust_log += &format!(",{loud_crate}=warn");
+            }
+        }
+        std::env::set_var("RUST_LOG", rust_log);
+    }
+
     // Log to stdout (if you run with `RUST_LOG=debug`).
     tracing_subscriber::fmt::init();
 
@@ -21,5 +32,5 @@ fn main() {
         "egui demo app",
         options,
         Box::new(|cc| Box::new(egui_demo_app::WrapApp::new(cc))),
-    );
+    )
 }