address review: a collapsed line break keeps its measured leading in tiny type

crates/svg/src/import/text.rs

@@ -950,7 +950,9 @@ fn lines(
     // A line's characters take its spacing as leading unless it is their auto leading.
     for (k, b) in breaks.iter().enumerate() {
         let end = breaks.get(k + 1).map_or(n, |nb| nb.at);
-        if cells[b.at..end].iter().any(|c| (c.style.effective_leading() - b.leading).abs() > 0.01) {
+        // 0.01 absolute, but never more than a thousandth of the spacing itself (tiny type has tiny gaps).
+        let tolerance = 0.01_f64.min(b.leading.abs() * 1e-3);
+        if cells[b.at..end].iter().any(|c| (c.style.effective_leading() - b.leading).abs() > tolerance) {
             for c in &mut cells[b.at..end] {
                 c.style.leading = Some(b.leading);
             }

crates/svg/tests/it/import_text.rs

@@ -232,6 +232,15 @@ fn per_character_positions_with_middle_anchor() {
     assert!(close(mid(0), 50.0, 0.05) && close(mid(1), 100.0, 0.05), "{} {}", mid(0), mid(1));
 }
 
+#[test]
+fn a_small_line_gap_in_tiny_type_keeps_its_leading() {
+    // 0.0085 against an auto leading of 0.006 differs by less than 0.01 but is not a whole multiple of it.
+    let d = open(r#"<text x="1" y="1" font-size="0.005">One<tspan x="1" dy="0.0085">Two</tspan></text>"#);
+    let t = only_text(&d);
+    let two = t.runs.iter().find(|r| r.text.contains("Two")).unwrap().style.leading;
+    assert!(two.is_some_and(|l| close(l, 0.0085, 1e-9)), "{two:?}");
+}
+
 #[test]
 fn tspan_lines_dx_and_baseline_shift() {
     let d = open(