Automatically generate screenshots for all examples (#2379)

examples/file_dialog/Cargo.toml

@@ -9,5 +9,7 @@ publish = false
 
 
 [dependencies]
-eframe = { path = "../../crates/eframe" }
+eframe = { path = "../../crates/eframe", features = [
+    "__screenshot", # __screenshot is so we can dump a ascreenshot using EFRAME_SCREENSHOT_TO
+] }
 rfd = "0.10"

examples/file_dialog/README.md

@@ -3,3 +3,5 @@ How to show a file dialog using [`rfd`](https://github.com/PolyMeilex/rfd).
 ```sh
 cargo run -p file_dialog
 ```
+
+![](screenshot.png)

examples/file_dialog/src/main.rs

@@ -5,6 +5,7 @@ use eframe::egui;
 fn main() {
     let options = eframe::NativeOptions {
         drag_and_drop_support: true,
+        initial_window_size: Some(egui::vec2(320.0, 240.0)),
         ..Default::default()
     };
     eframe::run_native(