fix layout undo history

include/core/maplayout.h

@@ -109,6 +109,8 @@ public:
     // QPixmap renderConnection(MapConnection, Layout *);
     QPixmap renderBorder(bool ignoreCache = false);
 
+    QPixmap getLayoutItemPixmap();
+
     void setLayoutItem(LayoutPixmapItem *item) { layoutItem = item; }
     void setCollisionItem(CollisionPixmapItem *item) { collisionItem = item; }
     void setBorderItem(BorderMetatilesPixmapItem *item) { borderItem = item; }

include/project.h

@@ -34,7 +34,7 @@ class Project : public QObject
 {
     Q_OBJECT
 public:
-    Project(QWidget *parent = nullptr);
+    Project(QObject *parent = nullptr);
     ~Project();
 
     Project(const Project &) = delete;