testsuite: Add testcase for z clipping

the near and far clipping plane are at -10000 and 10000 respectively.
Test that the renderers respect that.

testsuite/gsk/compare/z-transform-clipping-bounds-3d.node

@@ -0,0 +1,28 @@
+transform {
+  transform: translate3d(0, 0, -10000);
+  child: color {
+    bounds: 0 0 50 50;
+    color: rgb(255,0,0);
+  }
+}
+transform {
+  transform: translate3d(0, 0, -10001);
+  child: color {
+    bounds: 50 0 50 50;
+    color: rgb(255,255,0);
+  }
+}
+transform {
+  transform: translate3d(0, 0, 10000);
+  child: color {
+    bounds: 0 50 50 50;
+    color: rgb(0,255,0);
+  }
+}
+transform {
+  transform: translate3d(0, 0, 10001);
+  child: color {
+    bounds: 50 50 50 50;
+    color: rgb(0,0,255);
+  }
+}

testsuite/gsk/meson.build

@@ -88,6 +88,7 @@ compare_render_tests = [
   'texture-url',
   'transform-in-transform',
   'transform-in-transform-in-transform',
+  'z-transform-clipping-bounds-3d',
 ]
 
 # these are too sensitive to differences in the renderers