testsuite: Test we don't crash with overly large nodes

... when these nodes are used as children of a complex transform nodes
and we lose the clip.

testsuite/gsk/compare/transform-huge-child-3d.node

@@ -0,0 +1,17 @@
+/* a normal clip */
+clip {
+  clip: 0 0 50 50;
+  /* a 3D transform */
+  child: transform {
+    transform: rotateX(1);
+    /* a node that forces an offscreen */
+    child: rounded-clip {
+      clip: -30000 -30000 60000 60000 / 5;
+      child: color {
+        /* way too big, but it's clipped, so no problem */
+        bounds: -30000 -30000 60000 60000;
+        color: red;
+      }
+    }
+  }
+}

testsuite/gsk/compare/transform-huge-child.node

@@ -0,0 +1,13 @@
+clip {
+  clip: 0 0 50 50;
+  child: transform {
+    transform: rotate(1);
+    child: rounded-clip {
+      clip: -30000 -30000 60000 60000 / 5;
+      child: color {
+        bounds: -30000 -30000 60000 60000;
+        color: rgb(255,0,0);
+      }
+    }
+  }
+}

testsuite/gsk/meson.build

@@ -92,6 +92,8 @@ compare_render_tests = [
   'texture-scale-magnify-rotate',
   'texture-scale-stripes',
   'texture-url',
+  'transform-huge-child',
+  'transform-huge-child-3d',
   'transform-in-transform',
   'transform-in-transform-in-transform',
   'z-transform-clipping-bounds-3d',