Fix duplicate layer undo-redo

Sources/arm/History.hx

@@ -73,7 +73,12 @@ class History {
 				Context.layerPreviewDirty = true;
 			}
 			else if (step.name == tr("Duplicate Layer")) {
-				Context.layer = Project.layers[step.layer + 1];
+				var children = Project.layers[step.layer].getRecursiveChildren();
+				var position = step.layer + 1;
+				if (children != null)
+					position += children.length;
+
+				Context.layer = Project.layers[position];
 				Context.layer.delete();
 			}
 			else if (step.name == tr("Order Layers")) {
@@ -266,7 +271,10 @@ class History {
 			}
 			else if (step.name == tr("Duplicate Layer")) {
 				Context.layer = Project.layers[step.layer];
-				Context.layer = Context.layer.duplicate();
+				function _next() {
+					Layers.duplicateLayer(Context.layer);
+				}
+				App.notifyOnNextFrame(_next);
 			}
 			else if (step.name == tr("Order Layers")) {
 				var target = Project.layers[step.prev_order];

Sources/arm/Layers.hx

@@ -372,15 +372,11 @@ class Layers {
 
 	public static function duplicateLayer(l: LayerSlot) {
 		if (!l.isGroup()) {
-			Context.setLayer(l);
-			History.duplicateLayer();
 			var newLayer = l.duplicate();
 			Context.setLayer(newLayer);
 			var masks = l.getMasks(false);
 			if (masks != null) {
 				for (m in masks) {
-					Context.setLayer(m);
-					History.duplicateLayer();
 					m = m.duplicate();
 					m.parent = newLayer;
 					Project.layers.remove(m);
@@ -390,23 +386,18 @@ class Layers {
 			Context.setLayer(newLayer);
 		}
 		else {
-			// TODO: add undo-redo support for creating a new group
 			var newGroup = Layers.newGroup();
 			Project.layers.remove(newGroup);
 			Project.layers.insert(Project.layers.indexOf(l) + 1, newGroup);
 			// group.show_panel = true;
 			for (c in l.getChildren()) {
 				var masks = c.getMasks(false);
-				Context.setLayer(c);
-				History.duplicateLayer();
 				var newLayer = c.duplicate();
 				newLayer.parent = newGroup;
 				Project.layers.remove(newLayer);
 				Project.layers.insert(Project.layers.indexOf(newGroup), newLayer);
 				if (masks != null) {
 					for (m in masks) {
-						Context.setLayer(m);
-						History.duplicateLayer();
 						var newMask = m.duplicate();
 						newMask.parent = newLayer;
 						Project.layers.remove(newMask);
@@ -417,8 +408,6 @@ class Layers {
 			var groupMasks = l.getMasks();
 			if (groupMasks != null) {
 				for (m in groupMasks) {
-					Context.setLayer(m);
-					History.duplicateLayer();
 					var newMask = m.duplicate();
 					newMask.parent = newGroup;
 					Project.layers.remove(newMask);

Sources/arm/ui/TabLayers.hx

@@ -619,6 +619,8 @@ class TabLayers {
 			ui.enabled = true;
 			if (ui.button(tr("Duplicate"), Left)) {
 				function _init() {
+					Context.setLayer(l);
+					History.duplicateLayer();
 					Layers.duplicateLayer(l);
 				}
 				iron.App.notifyOnInit(_init);