[librsvg/librsvg-2.50] Add test with a viewBox

[Federico Mena Quintero <federico src gnome org>]

commit 2207ed4537c657e8a2b21fe8ad3e47fc48588ff7
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Sep 29 16:06:10 2020 -0500

    Add test with a viewBox

 librsvg_crate/tests/intrinsic_dimensions.rs | 31 +++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
---
diff --git a/librsvg_crate/tests/intrinsic_dimensions.rs b/librsvg_crate/tests/intrinsic_dimensions.rs
index db06cd3c..10859c43 100644
--- a/librsvg_crate/tests/intrinsic_dimensions.rs
+++ b/librsvg_crate/tests/intrinsic_dimensions.rs
@@ -112,6 +112,37 @@ fn layer_geometry_with_offset_viewport() {
     assert_eq!((ink_r, logical_r), (rect, rect));
 }
 
+#[test]
+fn layer_geometry_with_viewbox_and_offset_viewport() {
+    let svg = load_svg(
+        br#"<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"; width="100" height="100" viewBox="100 100 100 100">
+  <rect x="110" y="120" width="30" 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();
+
+    let rect = cairo::Rectangle {
+        x: 110.0,
+        y: 120.0,
+        width: 30.0,
+        height: 40.0,
+    };
+
+    assert_eq!((ink_r, logical_r), (rect, rect));
+}
+
 #[test]
 fn layer_geometry_with_percent_viewport() {
     let svg = load_svg(