feat: "q" to quit

src/main.rs

@@ -3,7 +3,7 @@ use std::env;
 use iced::{
     Color, Element, Renderer, Subscription, Task, Theme, color, event,
     keyboard::{self, Key, key},
-    theme, widget,
+    theme, widget, window,
 };
 use image::{EncodableLayout, ImageReader, RgbaImage};
 
@@ -55,6 +55,8 @@ impl State {
                     }
                 }
 
+                Key::Character("q") => return window::latest().and_then(window::close),
+
                 // ignore unused keys
                 _ => {}
             },