[librsvg/librsvg-2.50] Add test with a percentage viewport

[Federico Mena Quintero <federico src gnome org>]

commit e3be54e0fa0fe750383aa856da432b946362ea09
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Sep 29 16:20:20 2020 -0500

    Add test with a percentage viewport

 librsvg_crate/tests/intrinsic_dimensions.rs | 33 +++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
---
diff --git a/librsvg_crate/tests/intrinsic_dimensions.rs b/librsvg_crate/tests/intrinsic_dimensions.rs
index ff0363ea..43c8bbbe 100644
--- a/librsvg_crate/tests/intrinsic_dimensions.rs
+++ b/librsvg_crate/tests/intrinsic_dimensions.rs
@@ -208,6 +208,39 @@ fn layer_geometry_with_no_intrinsic_dimensions() {
     assert_eq!((ink_r, logical_r), (rect, rect));
 }
 
+#[test]
+fn layer_geometry_with_percentage_viewport() {
+    let svg = load_svg(
+        br#"<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"; width="100%" height="50%">
+  <rect x="10" y="20" width="50" height="40"/>
+</svg>
+"#,
+    );
+
+    let renderer = CairoRenderer::new(&svg);
+
+    let viewport = cairo::Rectangle {
+        x: 100.0,
+        y: 100.0,
+        width: 100.0,
+        height: 100.0,
+    };
+
+    let (ink_r, logical_r) = renderer.geometry_for_layer(None, &viewport).unwrap();
+
+    // Lack of viewBox means we use an identity transform, so the <rect> is just
+    // offset by (100, 100) because of the viewport.
+    let rect = cairo::Rectangle {
+        x: 110.0,
+        y: 120.0,
+        width: 50.0,
+        height: 40.0,
+    };
+
+    assert_eq!((ink_r, logical_r), (rect, rect));
+}
+
 #[test]
 fn layer_geometry_with_percent_viewport() {
     let svg = load_svg(