Implement AnimationPlayer call modes as per #23498.

doc/classes/AnimationPlayer.xml

@@ -237,6 +237,9 @@
 		<member name="current_animation_position" type="float" setter="" getter="get_current_animation_position">
 			The position (in seconds) of the currently playing animation.
 		</member>
+		<member name="method_call_mode" type="int" setter="set_method_call_mode" getter="get_method_call_mode" enum="AnimationPlayer.AnimationMethodCallMode">
+			The call mode to use for Call Method tracks. Default value: [code]ANIMATION_METHOD_CALL_DEFERRED[/code].
+		</member>
 		<member name="playback_active" type="bool" setter="set_active" getter="is_active">
 			If [code]true[/code], updates animations in response to process-related notifications. Default value: [code]true[/code].
 		</member>
@@ -292,5 +295,11 @@
 		<constant name="ANIMATION_PROCESS_MANUAL" value="2" enum="AnimationProcessMode">
 			Do not process animation. Use the 'advance' method to process the animation manually.
 		</constant>
+		<constant name="ANIMATION_METHOD_CALL_DEFERRED" value="0" enum="AnimationMethodCallMode">
+			Batch method calls during the animation process, then do the calls after events are processed. This avoids bugs involving deleting nodes or modifying the AnimationPlayer while playing.
+		</constant>
+		<constant name="ANIMATION_METHOD_CALL_IMMEDIATE" value="1" enum="AnimationMethodCallMode">
+			Make method calls immediately when reached in the animation.
+		</constant>
 	</constants>
 </class>

scene/animation/animation_player.cpp

@@ -545,14 +545,24 @@ void AnimationPlayer::_animation_process_animation(AnimationData *p_anim, float
 #endif
 
 					if (can_call) {
-						MessageQueue::get_singleton()->push_call(
-								nc->node,
-								method,
-								s >= 1 ? params[0] : Variant(),
-								s >= 2 ? params[1] : Variant(),
-								s >= 3 ? params[2] : Variant(),
-								s >= 4 ? params[3] : Variant(),
-								s >= 5 ? params[4] : Variant());
+						if (method_call_mode == ANIMATION_METHOD_CALL_DEFERRED) {
+							MessageQueue::get_singleton()->push_call(
+									nc->node,
+									method,
+									s >= 1 ? params[0] : Variant(),
+									s >= 2 ? params[1] : Variant(),
+									s >= 3 ? params[2] : Variant(),
+									s >= 4 ? params[3] : Variant(),
+									s >= 5 ? params[4] : Variant());
+						} else {
+							nc->node->call(
+									method,
+									s >= 1 ? params[0] : Variant(),
+									s >= 2 ? params[1] : Variant(),
+									s >= 3 ? params[2] : Variant(),
+									s >= 4 ? params[3] : Variant(),
+									s >= 5 ? params[4] : Variant());
+						}
 					}
 				}
 
@@ -1454,6 +1464,16 @@ AnimationPlayer::AnimationProcessMode AnimationPlayer::get_animation_process_mod
 	return animation_process_mode;
 }
 
+void AnimationPlayer::set_method_call_mode(AnimationMethodCallMode p_mode) {
+
+	method_call_mode = p_mode;
+}
+
+AnimationPlayer::AnimationMethodCallMode AnimationPlayer::get_method_call_mode() const {
+
+	return method_call_mode;
+}
+
 void AnimationPlayer::_set_process(bool p_process, bool p_force) {
 
 	if (processing == p_process && !p_force)
@@ -1635,6 +1655,9 @@ void AnimationPlayer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_animation_process_mode", "mode"), &AnimationPlayer::set_animation_process_mode);
 	ClassDB::bind_method(D_METHOD("get_animation_process_mode"), &AnimationPlayer::get_animation_process_mode);
 
+	ClassDB::bind_method(D_METHOD("set_method_call_mode", "mode"), &AnimationPlayer::set_method_call_mode);
+	ClassDB::bind_method(D_METHOD("get_method_call_mode"), &AnimationPlayer::get_method_call_mode);
+
 	ClassDB::bind_method(D_METHOD("get_current_animation_position"), &AnimationPlayer::get_current_animation_position);
 	ClassDB::bind_method(D_METHOD("get_current_animation_length"), &AnimationPlayer::get_current_animation_length);
 
@@ -1653,6 +1676,7 @@ void AnimationPlayer::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "playback_default_blend_time", PROPERTY_HINT_RANGE, "0,4096,0.01"), "set_default_blend_time", "get_default_blend_time");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "playback_active", PROPERTY_HINT_NONE, "", 0), "set_active", "is_active");
 	ADD_PROPERTY(PropertyInfo(Variant::REAL, "playback_speed", PROPERTY_HINT_RANGE, "-64,64,0.01"), "set_speed_scale", "get_speed_scale");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "method_call_mode", PROPERTY_HINT_ENUM, "Deferred,Immediate"), "set_method_call_mode", "get_method_call_mode");
 
 	ADD_SIGNAL(MethodInfo("animation_finished", PropertyInfo(Variant::STRING, "anim_name")));
 	ADD_SIGNAL(MethodInfo("animation_changed", PropertyInfo(Variant::STRING, "old_name"), PropertyInfo(Variant::STRING, "new_name")));
@@ -1662,6 +1686,9 @@ void AnimationPlayer::_bind_methods() {
 	BIND_ENUM_CONSTANT(ANIMATION_PROCESS_PHYSICS);
 	BIND_ENUM_CONSTANT(ANIMATION_PROCESS_IDLE);
 	BIND_ENUM_CONSTANT(ANIMATION_PROCESS_MANUAL);
+
+	BIND_ENUM_CONSTANT(ANIMATION_METHOD_CALL_DEFERRED);
+	BIND_ENUM_CONSTANT(ANIMATION_METHOD_CALL_IMMEDIATE);
 }
 
 AnimationPlayer::AnimationPlayer() {
@@ -1674,6 +1701,7 @@ AnimationPlayer::AnimationPlayer() {
 	end_reached = false;
 	end_notify = false;
 	animation_process_mode = ANIMATION_PROCESS_IDLE;
+	method_call_mode = ANIMATION_METHOD_CALL_DEFERRED;
 	processing = false;
 	default_blend_time = 0;
 	root = SceneStringNames::get_singleton()->path_pp;

scene/animation/animation_player.h

@@ -68,6 +68,11 @@ public:
 		ANIMATION_PROCESS_MANUAL,
 	};
 
+	enum AnimationMethodCallMode {
+		ANIMATION_METHOD_CALL_DEFERRED,
+		ANIMATION_METHOD_CALL_IMMEDIATE,
+	};
+
 private:
 	enum {
 
@@ -243,6 +248,7 @@ private:
 
 	String autoplay;
 	AnimationProcessMode animation_process_mode;
+	AnimationMethodCallMode method_call_mode;
 	bool processing;
 	bool active;
 
@@ -335,6 +341,9 @@ public:
 	void set_animation_process_mode(AnimationProcessMode p_mode);
 	AnimationProcessMode get_animation_process_mode() const;
 
+	void set_method_call_mode(AnimationMethodCallMode p_mode);
+	AnimationMethodCallMode get_method_call_mode() const;
+
 	void seek(float p_time, bool p_update = false);
 	void seek_delta(float p_time, float p_delta);
 	float get_current_animation_position() const;
@@ -360,5 +369,6 @@ public:
 };
 
 VARIANT_ENUM_CAST(AnimationPlayer::AnimationProcessMode);
+VARIANT_ENUM_CAST(AnimationPlayer::AnimationMethodCallMode);
 
 #endif