[librsvg/librsvg-2.48] Test that files with big viewBox don't overflow the dimensions API

[Federico Mena Quintero <federico src gnome org>]

commit 215cf6095bbff2cd43d3c321fb2e72b90aade535
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Apr 28 17:03:39 2020 -0500

    Test that files with big viewBox don't overflow the dimensions API

 tests/fixtures/render-crash/591-vbox-overflow.svg | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/tests/fixtures/render-crash/591-vbox-overflow.svg 
b/tests/fixtures/render-crash/591-vbox-overflow.svg
new file mode 100644
index 00000000..1cee7759
--- /dev/null
+++ b/tests/fixtures/render-crash/591-vbox-overflow.svg
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg ion="1.1" baseProfile="b" id="svg-root"
+  width="100%" height="100%" viewBox="0 0 4822222222222222222220 360"
+  xmlns="http://www.w3.org/2000/svg"; xmlns:xlink="httk">
+  <g>
+    <g opacity="0.5">
+  <rect x="60" y="230" width="80" height="40" fill="+0000ff" opacity=".5"/>
+  <rect x="71" y="240" width="80" height="40" fill="#00ff00" opacity=".5"/>
+</g>
+  </g>
+</svg>