fix regression and recreate asset fo

standalone-openfl-app/src/Main.hx

@@ -1,6 +1,7 @@
 package;
 
 import openfl.display.Sprite;
+import Assets; // Forces build(macros.AssetMacro.build()) to run.
 
 class Main extends Sprite {
     public function new() {

standalone-openfl-app/src/macros/AssetMacro.hx

@@ -41,7 +41,10 @@ class AssetMacro {
         var manifestDir = outputDir + "/manifest";
         var assetsOutputDir = outputDir + "/assets";
         
-        // Create directories if they don't exist
+        // These directories are owned by this macro. Recreate them so removed or
+        // renamed source assets cannot survive as stale build output.
+        removeDirectory(manifestDir);
+        removeDirectory(assetsOutputDir);
         createDirectory(manifestDir);
         createDirectory(assetsOutputDir);
         copyLimeNativeLibrary(outputDir);
@@ -241,6 +244,20 @@ class AssetMacro {
         }
     }
     
+    private static function removeDirectory(path:String):Void {
+        if (!FileSystem.exists(path)) return;
+
+        for (entry in FileSystem.readDirectory(path)) {
+            var entryPath = path + "/" + entry;
+            if (FileSystem.isDirectory(entryPath)) {
+                removeDirectory(entryPath);
+            } else {
+                FileSystem.deleteFile(entryPath);
+            }
+        }
+        FileSystem.deleteDirectory(path);
+    }
+
     /** Stage the Lime CFFI module that matches the selected haxelib version. */
     private static function copyLimeNativeLibrary(outputDir:String):Void {
         var platformDirectory = if (Context.defined("linux")) {