tri/cube: Add WM_SIZE to Win32 event handler to resize a window.
diff --git a/demos/cube.c b/demos/cube.c
index 6637bce..b1c4c6f 100644
--- a/demos/cube.c
+++ b/demos/cube.c
@@ -1944,6 +1944,9 @@
     case WM_PAINT:
         demo_run(&demo);
         break;
+    case WM_SIZE:
+        demo_resize(&demo);
+        break;
     default:
         break;
     }