Groups now also have a convexHull

cura/ConvexHullDecorator.py

@@ -0,0 +1,28 @@
+from UM.Scene.SceneNodeDecorator import SceneNodeDecorator
+
+class ConvexHullDecorator(SceneNodeDecorator):
+    def __init__(self):
+        super().__init__()
+        self._convex_hull = None
+        self._convex_hull_node = None
+        self._convex_hull_job = None
+        
+    def getConvexHull(self):
+        return self._convex_hull
+    
+    def setConvexHull(self, hull):
+        self._convex_hull = hull
+    
+    def getConvexHullJob(self):
+        return self._convex_hull_job
+    
+    def setConvexHullJob(self, job):
+        self._convex_hull_job = job
+    
+    def getConvexHullNode(self):
+        return self._convex_hull_node
+    
+    def setConvexHullNode(self, node):
+        self._convex_hull_node = node
+            
+