Fix render target unload for d3d12

Sources/arm/App.hx

@@ -319,7 +319,11 @@ class App {
 		}
 
 		if (UINodes.inst.grid != null) {
-			UINodes.inst.grid.unload();
+			var _grid = UINodes.inst.grid;
+			function _next() {
+				_grid.unload();
+			}
+			App.notifyOnNextFrame(_next);
 			UINodes.inst.grid = null;
 		}
 

Sources/arm/data/MaterialSlot.hx

@@ -52,7 +52,10 @@ class MaterialSlot {
 	}
 
 	public function unload() {
-		image.unload();
-		imageIcon.unload();
+		function _next() {
+			image.unload();
+			imageIcon.unload();
+		}
+		App.notifyOnNextFrame(_next);
 	}
 }

Sources/arm/node/MakeMaterial.hx

@@ -230,19 +230,25 @@ class MakeMaterial {
 	static function bakeNodePreviews() {
 		if (Context.nodePreviewsBlur != null) {
 			for (image in Context.nodePreviewsBlur) {
-				image.unload();
+				App.notifyOnNextFrame(function() {
+					image.unload();
+				});
 			}
 			Context.nodePreviewsBlur = null;
 		}
 		if (Context.nodePreviewsWarp != null) {
-			for (img in Context.nodePreviewsWarp) {
-				img.unload();
+			for (image in Context.nodePreviewsWarp) {
+				App.notifyOnNextFrame(function() {
+					image.unload();
+				});
 			}
 			Context.nodePreviewsWarp = null;
 		}
 		if (Context.nodePreviewsBake != null) {
-			for (img in Context.nodePreviewsBake) {
-				img.unload();
+			for (image in Context.nodePreviewsBake) {
+				App.notifyOnNextFrame(function() {
+					image.unload();
+				});
 			}
 			Context.nodePreviewsBake = null;
 		}