Fix a memory leak/resource cache issue, that keeps multimeshes in mem…

…ory and spams 'instance_count > 0' errors when opening a scene

addons/dreadpon.spatial_gardener/arborist/arborist.gd

@@ -121,14 +121,22 @@ func _enter_tree():
 #	thread_instance_placement.start(Callable(self,"thread_update_LODs"))
 
 
+func _notification(what):
+	match what:
+		NOTIFICATION_PREDELETE:
+			for octree_manager in octree_managers:
+				octree_manager.destroy()
+
+
 func _exit_tree():
+	pass
 	# This is... weird
 	# Apparently I need to free any Resources that are left after closing a scene
 	# I'm not exactly sure why
 	# And it *might* be destructive to do so in editor
-	if Engine.is_editor_hint(): return
-#	for octree_manager in octree_managers:
-#		octree_manager.destroy()
+	#if Engine.is_editor_hint(): return
+	#for octree_manager in octree_managers:
+		#octree_manager.destroy()
 #	octree_managers = []
 #	mutex_placement.lock()
 #	exit_instance_placement = true

addons/dreadpon.spatial_gardener/arborist/mmi_octree/mmi_octree_node.gd

@@ -193,6 +193,13 @@ func set_is_leaf(val):
 
 
 func destroy():
+	member_placeforms = []
+	parent = null
+	MMI_container = null
+	MMI = null
+	MMI_multimesh = null
+	shared_LOD_variants = []
+
 	for child in child_nodes:
 		child.destroy()
 	child_nodes = []

testing/tests/gardener_tests/test_gardener_base.gd

@@ -67,6 +67,7 @@ func _enter_tree():
 
 func _exit_tree():
 	FunLib.free_children(self)
+	gardener = null
 
 
 func dpon_testing_set_editor_selection(val):

testing/tests/gardener_tests/test_gardener_save_load_painting.gd

@@ -75,8 +75,10 @@ func save_gardener():
 	var packed_scene = PackedScene.new()
 	packed_scene.pack(gardener)
 	FunLib.save_res(packed_scene, greenhouse_path, "gardener.tscn")
-	remove_child(gardener)
 	editor_selection.clear()
+	remove_child(gardener)
+	gardener.free()
+	gardener = null
 
 
 func load_gardener():