Update gsk tests

Add a clip-coordinates-2d test that is similar
to clip-coordinates-3d, but actually uses a 2D
transform.

testsuite/gsk/compare/clip-coordinates-2d.node

@@ -0,0 +1,22 @@
+/* This test checks that we get sharp clip boundaries
+ * for 2d transforms. Compare with clip-coordinates-3d.node,
+ * which uses a general transform and gets offscreen
+ * rendering with GL_LINEAR.
+ */
+transform {
+  transform: scale(2);
+  child: container {
+    color {
+      bounds: 0 0 50 50;
+      color: transparent;
+    }
+
+    clip {
+      clip: 10 10 30 30;
+      child: color {
+        bounds: 0 0 50 50;
+        color: red;
+      }
+    }
+  }
+}

testsuite/gsk/meson.build

@@ -22,6 +22,7 @@ node_parser = executable(
 compare_render_tests = [
   'blend-normal',
   'blend-difference',
+  'clip-coordinates-2d',
   'clip-coordinates-3d',
   'clipped_rounded_clip',
   'color-blur0',