Fix #1800: macOS Save As shows its sheet again

The Format menu added to the save sheet after rfd began it (#866) made recent
macOS versions (26.6.2 and 27.0.1 reported) dismiss the sheet at once: Save As,
Save a Copy and Save of an untitled document flashed and answered as cancelled,
while panels without it (Open, Export As) worked. The accessory is withdrawn
until it can be set before the sheet is presented; the format still follows
the extension typed in the name field, as before #866.

apps/vectorcraft/src/main.rs

@@ -35,8 +35,6 @@ mod mac_fonts;
 #[cfg(target_os = "macos")]
 mod mac_menu;
 #[cfg(target_os = "macos")]
-mod mac_save_format;
-#[cfg(target_os = "macos")]
 mod mac_window;
 #[cfg(target_os = "macos")]
 mod open_documents;
@@ -480,9 +478,10 @@ fn start_pick(request: PickRequest, parent: &Parent, ui: &egui::Context) -> Opti
             let picked = dialog.pick_files();
             Box::pin(async move { picked.await.unwrap_or_default().iter().map(path).collect() })
         }
-        PickRequest::Save(pick) => {
+        PickRequest::Save(_) => {
+            // Nothing is added to the sheet once rfd has begun it: an accessory view set then made
+            // recent macOS versions dismiss the sheet at once, so nothing could be saved (#1800).
             let picked = dialog.save_file();
-            mac_save_format::attach(window, &pick);
             Box::pin(async move { picked.await.iter().map(path).collect() })
         }
         PickRequest::Folder => {