From 98ba3db502d674896cc9992818aae908db9647fa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pedro=20J=2E=20Est=C3=A9banez?= <pedrojrulez@gmail.com>
Date: Mon, 20 Mar 2017 19:36:43 +0100
Subject: [PATCH] Fix Particles2D process mode back-compat issue

---
 scene/2d/particles_2d.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scene/2d/particles_2d.cpp b/scene/2d/particles_2d.cpp
index d2c8faad034..7c6a67a68e3 100644
--- a/scene/2d/particles_2d.cpp
+++ b/scene/2d/particles_2d.cpp
@@ -453,6 +453,9 @@ void Particles2D::_notification(int p_what) {
 
 		case NOTIFICATION_ENTER_TREE: {
 
+			// For projects saved before "process_mode" was introduced
+			set_process_mode(process_mode);
+
 			float ppt = preprocess;
 			while (ppt > 0) {
 				_process_particles(0.1);