Fix #4920: one file per copy

Each copy is saved with images embedded and artboards together, so a
document last saved with linked SVG images writes no image files beside
its copy; any other file a save reports is reserved for the copies still
to come.

crates/engine/src/cmd/addons/document.rs

@@ -36,7 +36,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Export All Open Documents",
             ["Object", "Plug-ins", "Document Tools"],
             None,
-            "{folder, format?: vectorcraft|pdf|svg|svgz|ai|eps (default: pdf)} write a copy of every open document, in tab order, to `folder` as File › Save a Copy writes it, each named after its document (<name>.<ext>; -2, -3… added when that name is taken, so no file is replaced): every document keeps its path, title and modified state, and no undo step is made. A document that can't be written is listed in `failed` and the others are still written; the active document stays active → {files: [{title, path, warnings}], failed: [{title, error}], format}",
+            "{folder, format?: vectorcraft|pdf|svg|svgz|ai|eps (default: pdf)} write a copy of every open document, in tab order, to `folder` as File › Save a Copy writes it, each named after its document (<name>.<ext>; -2, -3… added when that name is taken, so no file is replaced), one file each (images embedded, artboards together): every document keeps its path, title and modified state, and no undo step is made. A document that can't be written is listed in `failed` and the others are still written; the active document stays active → {files: [{title, path, warnings}], failed: [{title, error}], format}",
             has_doc,
             export_all_open
         ),
@@ -117,9 +117,21 @@ fn export_all_open(s: &mut Session, p: &Value) -> Result<Value> {
             failed.push(json!({ "title": title, "error": "every numbered name for the copy is taken" }));
             continue;
         };
-        match fileio::save_document(s, SaveMode::Copy, &json!({ "path": path, "format": format.id })) {
+        // One file per document: the remembered options of a document saved before in this format
+        // (linked SVG images, separate artboard files) would write others beside it. Each format
+        // reads only the options it has.
+        let options = json!({ "images": "embed", "separateArtboards": false });
+        match fileio::save_document(s, SaveMode::Copy, &json!({ "path": path, "format": format.id, "options": options })) {
             Ok(r) => {
                 written.push(path.clone());
+                // Any other file the save wrote is taken for the copies still to come.
+                for key in ["files", "linked"] {
+                    for f in r.get(key).and_then(Value::as_array).into_iter().flatten() {
+                        if let Some(f) = f.as_str().or_else(|| f.get("path").and_then(Value::as_str)) {
+                            written.push(f.to_string());
+                        }
+                    }
+                }
                 files.push(json!({ "title": title, "path": r.get("path").cloned().unwrap_or(json!(path)), "warnings": r.get("warnings").cloned().unwrap_or(json!([])) }));
             }
             Err(e) => failed.push(json!({ "title": title, "error": e.to_string() })),

crates/engine/src/cmd/addons/document/tests.rs

@@ -217,3 +217,26 @@ fn export_all_open_documents_writes_each_and_reports_failures() {
     assert_eq!(s.active_index(), Some(0));
     let _ = std::fs::remove_dir_all(&dir);
 }
+
+/// An SVG document last saved with linked images exports as one SVG with its images embedded: no
+/// image file is written beside the copies (#4920 review).
+#[test]
+fn export_all_open_documents_writes_one_file_each() {
+    let dir = std::env::temp_dir().join(format!("vc-export-all-one-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    std::fs::create_dir_all(dir.join("out")).unwrap();
+    let mut s = Session::new();
+    s.execute("file.new", &json!({"width": 100, "height": 100, "name": "pic"})).unwrap();
+    let mut png = vec![];
+    image::RgbaImage::from_pixel(4, 4, image::Rgba([1, 2, 3, 255])).write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png).unwrap();
+    s.execute("file.place", &json!({"name": "a.png", "dataBase64": vectorcraft_format::base64_encode(&png)})).unwrap();
+    s.execute("document.save", &json!({"path": dir.join("pic.svg"), "format": "svg", "options": {"images": "link"}})).unwrap();
+    let saved: Vec<_> = std::fs::read_dir(&dir).unwrap().filter_map(|e| e.ok()).filter(|e| e.path().is_file()).collect();
+    assert!(saved.len() > 1, "the linked save wrote its image beside it: {saved:?}");
+    let out = dir.join("out");
+    let r = s.execute("addon.document.exportAllOpen", &json!({"folder": out, "format": "svg"})).unwrap();
+    let names: Vec<String> = std::fs::read_dir(&out).unwrap().map(|e| e.unwrap().file_name().to_string_lossy().into_owned()).collect();
+    assert_eq!(names, ["pic.svg"], "{r}");
+    assert!(std::fs::read_to_string(out.join("pic.svg")).unwrap().contains("data:image/png;base64,"), "the image is embedded");
+    let _ = std::fs::remove_dir_all(&dir);
+}