testsuite: Add a testcase for repeat nodes that don't repeat

testsuite/gsk/compare/repeat-no-repeat.node

@@ -0,0 +1,14 @@
+repeat {
+  child: container {
+    color {
+      color: red;
+      bounds: 0 0 50 50;
+    }
+    color {
+      color: blue;
+      bounds: 50 0 50 50;
+    }
+  }
+
+  bounds: 50 0 50 50;
+}

testsuite/gsk/meson.build

@@ -59,6 +59,7 @@ compare_render_tests = [
   'opacity-overlapping-children',
   'repeat',
   'repeat-texture',
+  'repeat-no-repeat',
 ]
 
 # these are too sensitive to differences in the renderers