Merge pull request #493 from ynput/bugfix/the_scene_isn't_reset_corre…

…ctly_when_starting_new_scene_after_loading_objects

Max: reset scene and clear undo buffer when starting new scene

client/ayon_core/hosts/max/api/pipeline.py

@@ -52,11 +52,7 @@ def install(self):
 
         self._has_been_setup = True
 
-        def context_setting():
-            return lib.set_context_setting()
-
-        rt.callbacks.addScript(rt.Name('systemPostNew'),
-                               context_setting)
+        rt.callbacks.addScript(rt.Name('systemPostNew'), on_new)
 
         rt.callbacks.addScript(rt.Name('filePostOpen'),
                                lib.check_colorspace)
@@ -163,6 +159,14 @@ def ls() -> list:
         yield lib.read(container)
 
 
+def on_new():
+    lib.set_context_setting()
+    if rt.checkForSave():
+        rt.resetMaxFile(rt.Name("noPrompt"))
+        rt.clearUndoBuffer()
+        rt.redrawViews()
+
+
 def containerise(name: str, nodes: list, context,
                  namespace=None, loader=None, suffix="_CON"):
     data = {