testsuite: Add a variant of an existing test

This variant ccreates a huge node in the clipped region and tests that
renderers properly clip it away.

testsuite/gsk/compare/blur-huge-contents-outside-of-clip.node

@@ -0,0 +1,40 @@
+color-matrix {
+  matrix: matrix3d(256, 0, 0, 0, 0, 256, 0, 0, 0, 0, 256, 0, 0, 0, 0, 256);
+  child: clip {
+    clip: -37 59 50 50;
+    child: container {
+      blur {
+        blur: 17;
+        child: color {
+          bounds: -20037 59 20000 50;
+          color: rgb(255,0,0);
+        }
+      }
+      blur {
+        blur: 17;
+        child: color {
+          bounds: 13 59 20000 50;
+          color: rgb(255,0,0);
+        }
+      }
+      blur {
+        blur: 17;
+        child: color {
+          bounds: -37 -19941 50 20000;
+          color: rgb(255,0,0);
+        }
+      }
+      blur {
+        blur: 17;
+        child: color {
+          bounds: -37 109 50 20000;
+          color: rgb(255,0,0);
+        }
+      }
+      color {
+        bounds: -22 74 20 20;
+        color: rgb(0,0,0);
+      }
+    }
+  }
+}

testsuite/gsk/meson.build

@@ -22,6 +22,7 @@ compare_render_tests = [
   'blurred-lines',
   'blur-child-bounds-oversize',
   'blur-contents-outside-of-clip',
+  'blur-huge-contents-outside-of-clip',
   'border-bottom-right',
   'border-one-rounded',
   'borders-rotated',