Add a failing testcase

This renders ok only with cairo.

testsuite/gsk/compare/crosshair.node

@@ -0,0 +1,13 @@
+transform {
+  child: container {
+    color {
+      bounds: 1 1 200 1;
+      color: black;
+    }
+    color {
+      bounds: 100 -100 1 200;
+      color: black;
+    }    
+  }
+  transform: scale(0.5,0.5);
+}

testsuite/gsk/meson.build

@@ -35,6 +35,7 @@ compare_render_tests = [
   'clip-nested1',
   'color-blur0',
   'color-matrix-identity',
+  'crosshair',
   'cross-fade-in-opacity',
   'css-background',
   'empty-blend',