From 73f53a791859b4ecb7df7ab99ffe2e875873f159 Mon Sep 17 00:00:00 2001
From: volzhs <volzhs@gmail.com>
Date: Mon, 3 Apr 2017 21:00:38 +0900
Subject: [PATCH 1/2] Fix monitoring status of Area2D

---
 scene/2d/area_2d.cpp | 11 ++++++++---
 scene/2d/area_2d.h   |  1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/scene/2d/area_2d.cpp b/scene/2d/area_2d.cpp
index fff399f8f9e..1a53f684e8a 100644
--- a/scene/2d/area_2d.cpp
+++ b/scene/2d/area_2d.cpp
@@ -380,6 +380,10 @@ void Area2D::_notification(int p_what) {
 
 	switch (p_what) {
 
+		case NOTIFICATION_READY: {
+
+			is_ready = true;
+		} break;
 		case NOTIFICATION_EXIT_TREE: {
 
 			monitoring_stored = monitoring;
@@ -387,8 +391,8 @@ void Area2D::_notification(int p_what) {
 			_clear_monitoring();
 		} break;
 		case NOTIFICATION_ENTER_TREE: {
-
-			set_enable_monitoring(monitoring_stored);
+			if (is_ready)
+				set_enable_monitoring(monitoring_stored);
 		} break;
 	}
 }
@@ -646,7 +650,8 @@ Area2D::Area2D()
 	monitorable = false;
 	collision_mask = 1;
 	layer_mask = 1;
-	monitoring_stored = true;
+	monitoring_stored = false;
+	is_ready = false;
 	set_enable_monitoring(true);
 	set_monitorable(true);
 }
diff --git a/scene/2d/area_2d.h b/scene/2d/area_2d.h
index 8e854d4744b..1860127cb54 100644
--- a/scene/2d/area_2d.h
+++ b/scene/2d/area_2d.h
@@ -60,6 +60,7 @@ private:
 	bool monitoring_stored;
 	bool monitorable;
 	bool locked;
+	bool is_ready;
 
 	void _body_inout(int p_status, const RID &p_body, int p_instance, int p_body_shape, int p_area_shape);
 

From 622282153516cf1000473b86ceafd797f81a9760 Mon Sep 17 00:00:00 2001
From: volzhs <volzhs@gmail.com>
Date: Tue, 4 Apr 2017 10:37:45 +0900
Subject: [PATCH 2/2] Apply same logic to Area with Area2D

comes from 5b556ca and 73f53a7
---
 scene/3d/area.cpp | 34 ++++++++++++++++++++++++++--------
 scene/3d/area.h   |  2 ++
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/scene/3d/area.cpp b/scene/3d/area.cpp
index f0dec5d2e37..b4c63d6292f 100644
--- a/scene/3d/area.cpp
+++ b/scene/3d/area.cpp
@@ -227,6 +227,10 @@ void Area::_clear_monitoring() {
 			Object *obj = ObjectDB::get_instance(E->key());
 			Node *node = obj ? obj->cast_to<Node>() : NULL;
 			ERR_CONTINUE(!node);
+
+			node->disconnect(SceneStringNames::get_singleton()->enter_tree, this, SceneStringNames::get_singleton()->_body_enter_tree);
+			node->disconnect(SceneStringNames::get_singleton()->exit_tree, this, SceneStringNames::get_singleton()->_body_exit_tree);
+
 			if (!E->get().in_tree)
 				continue;
 
@@ -236,9 +240,6 @@ void Area::_clear_monitoring() {
 			}
 
 			emit_signal(SceneStringNames::get_singleton()->body_exit, obj);
-
-			node->disconnect(SceneStringNames::get_singleton()->enter_tree, this, SceneStringNames::get_singleton()->_body_enter_tree);
-			node->disconnect(SceneStringNames::get_singleton()->exit_tree, this, SceneStringNames::get_singleton()->_body_exit_tree);
 		}
 	}
 
@@ -253,6 +254,10 @@ void Area::_clear_monitoring() {
 			Object *obj = ObjectDB::get_instance(E->key());
 			Node *node = obj ? obj->cast_to<Node>() : NULL;
 			ERR_CONTINUE(!node);
+
+			node->disconnect(SceneStringNames::get_singleton()->enter_tree, this, SceneStringNames::get_singleton()->_area_enter_tree);
+			node->disconnect(SceneStringNames::get_singleton()->exit_tree, this, SceneStringNames::get_singleton()->_area_exit_tree);
+
 			if (!E->get().in_tree)
 				continue;
 
@@ -262,16 +267,27 @@ void Area::_clear_monitoring() {
 			}
 
 			emit_signal(SceneStringNames::get_singleton()->area_exit, obj);
-
-			node->disconnect(SceneStringNames::get_singleton()->enter_tree, this, SceneStringNames::get_singleton()->_area_enter_tree);
-			node->disconnect(SceneStringNames::get_singleton()->exit_tree, this, SceneStringNames::get_singleton()->_area_exit_tree);
 		}
 	}
 }
 void Area::_notification(int p_what) {
 
-	if (p_what == NOTIFICATION_EXIT_TREE) {
-		_clear_monitoring();
+	switch (p_what) {
+
+		case NOTIFICATION_READY: {
+
+			is_ready = true;
+		} break;
+		case NOTIFICATION_EXIT_TREE: {
+
+			monitoring_stored = monitoring;
+			set_enable_monitoring(false);
+			_clear_monitoring();
+		} break;
+		case NOTIFICATION_ENTER_TREE: {
+			if (is_ready)
+				set_enable_monitoring(monitoring_stored);
+		} break;
 	}
 }
 
@@ -627,6 +643,8 @@ Area::Area()
 	monitoring = false;
 	collision_mask = 1;
 	layer_mask = 1;
+	monitoring_stored = false;
+	is_ready = false;
 	set_ray_pickable(false);
 	set_enable_monitoring(true);
 	set_monitorable(true);
diff --git a/scene/3d/area.h b/scene/3d/area.h
index 75c66c88beb..718243fdb0a 100644
--- a/scene/3d/area.h
+++ b/scene/3d/area.h
@@ -57,8 +57,10 @@ private:
 	uint32_t layer_mask;
 	int priority;
 	bool monitoring;
+	bool monitoring_stored;
 	bool monitorable;
 	bool locked;
+	bool is_ready;
 
 	void _body_inout(int p_status, const RID &p_body, int p_instance, int p_body_shape, int p_area_shape);