testsuite: Add a test for nearest vs linear scales

testsuite/gsk/compare/texture-scale-nearest-vs-linear.node

@@ -0,0 +1,16 @@
+color-matrix {
+  matrix: matrix3d(1000, 0, 0, 0, 0, 1000, 0, 0, 0, 0, 1000, 0, 0, 0, 0, 1);
+  child: container {
+    texture-scale {
+      bounds: 0 0 20 10;
+      texture: "texture1" url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAABCAYAAAD0In+KAAAAEUlEQVQImWP4z8Dwn+E/w38AEPgD\
+/V+dao0AAAAASUVORK5CYII=\
+");
+    }
+    texture-scale {
+      bounds: 0 15 20 10;
+      filter: nearest;
+      texture: "texture1";
+    }
+  }
+}

testsuite/gsk/meson.build

@@ -101,6 +101,7 @@ compare_render_tests = [
   'texture-scale-filters-3d',
   'texture-scale-magnify-10000x',
   'texture-scale-magnify-rotate',
+  'texture-scale-nearest-vs-linear',
   'texture-scale-stripes',
   'texture-url',
   'transform-in-transform',