fix: add error handling to save dialog and auto_save false test

src/color_scheme.rs

@@ -282,4 +282,22 @@ mod tests {
 
         std::fs::remove_dir_all(&dir).ok();
     }
+
+    #[test]
+    fn update_color_auto_save_false_does_not_write() {
+        let dir = std::env::temp_dir().join(format!("auto_save_false_{}", std::process::id()));
+        std::fs::create_dir_all(&dir).ok();
+        let file = dir.join("icon.svg");
+        std::fs::write(&file, SINGLE_COLOR_SVG).unwrap();
+
+        let mut scheme = ColorScheme::load(&file).unwrap();
+        scheme.auto_save = false;
+
+        assert!(scheme.update_color("ColorScheme-Text", "#000000").unwrap());
+        
+        let file_content = std::fs::read_to_string(&file).unwrap();
+        assert_eq!(file_content, SINGLE_COLOR_SVG, "Disk content should not be modified");
+        
+        std::fs::remove_dir_all(&dir).ok();
+    }
 }

src/main.rs

@@ -126,7 +126,9 @@ fn build_editor(stack: &Stack, window: &ApplicationWindow, icon_path: PathBuf) {
                 dialog.save(Some(&window), gtk::gio::Cancellable::NONE, move |res| {
                     if let Ok(file) = res {
                         if let Some(path) = file.path() {
-                            let _ = std::fs::write(path, comp.borrow().render());
+                            if let Err(e) = std::fs::write(&path, comp.borrow().render()) {
+                                eprintln!("Failed to save composite to {}: {e}", path.display());
+                            }
                         }
                     }
                 });