SVG export: type with small capitals, superscript, subscript or tab leaders is written as outlines (#3869)

crates/engine/src/cmd/fileio/tests_svg.rs

@@ -180,6 +180,30 @@ fn reopened_preserve_editing_svg_saves_as_the_full_document() {
     let _ = std::fs::remove_dir_all(dir);
 }
 
+/// #3869: small capitals, superscript and subscript, and tab leaders, which SVG text can't draw,
+/// are written as outlines (as vertical type and ruby are) rather than as plain text at full size;
+/// type without them stays text.
+#[test]
+fn type_svg_text_cant_draw_is_written_as_outlines() {
+    let mut s = Session::new();
+    s.execute("file.new", &json!({"width": 500, "height": 200})).unwrap();
+    s.execute("text.create", &json!({"x": 50, "y": 100, "text": "Small caps x2 H2O", "size": 30})).unwrap();
+    let plain = svg(&mut s, json!({}));
+    assert!(plain.contains("<text"), "plain type stays text: {plain}");
+    for style in [json!({"smallCaps": true}), json!({"position": "superscript"}), json!({"position": "subscript"})] {
+        let mut t = Session::new();
+        t.execute("file.new", &json!({"width": 500, "height": 200})).unwrap();
+        let id = t.execute("text.create", &json!({"x": 50, "y": 100, "text": "Small caps x2 H2O", "size": 30})).unwrap()["id"].clone();
+        let mut p = style.clone();
+        p["id"] = id;
+        p["start"] = json!(0);
+        p["end"] = json!(5);
+        t.execute("text.setRangeStyle", &p).unwrap();
+        let out = svg(&mut t, json!({}));
+        assert!(!out.contains("<text") && out.contains("<path"), "{style}: {out}");
+    }
+}
+
 #[test]
 fn save_writes_svg_and_remembers_its_options() {
     let mut s = session(1);

crates/svg/src/export.rs

@@ -1863,8 +1863,12 @@ impl Writer<'_> {
         let resolved = doc.inline_resolved(t);
         let t = &*resolved;
         let inline = t.runs.iter().any(|r| r.inline.is_some());
-        // Ruby is written as outlines with its base text: a reader's <text> can't place it.
-        let outlined = self.opts.outline_text || t.vertical || !t.ruby.is_empty() || (inline && matches!(t.kind, TextKind::OnPath { .. }));
+        // Ruby is written as outlines with its base text: a reader's <text> can't place it. So are
+        // small capitals, superscript and subscript and tab leaders, which SVG text doesn't draw (#3869).
+        let unwritable = t.runs.iter().any(|r| r.style.small_caps.is_some() || r.style.position != vectorcraft_doc::CharPosition::Normal)
+            || std::iter::once(&t.para).chain(&t.paras).any(|p| p.tabs.iter().any(|tab| !tab.leader.is_empty()));
+        let outlined =
+            self.opts.outline_text || t.vertical || !t.ruby.is_empty() || (inline && matches!(t.kind, TextKind::OnPath { .. })) || unwritable;
         let chars = |w: &mut Self, n: &Node| if outlined { w.text_outlines(n, t) } else { w.text(n, t) };
         let painted = n.appearance.items.iter().any(|i| i.visible() && !i.paint().is_none());
         // Live type with an inside or outside character stroke writes that stroke apart from the