From 475e8b28b28962a24b783597f9a3cabf4a370dee Mon Sep 17 00:00:00 2001
From: Juan Linietsky
Date: Sun, 6 Aug 2017 09:32:52 -0300
Subject: keep default exported script values unless overriden, closes #8127

---
 core/script_language.cpp | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'core/script_language.cpp')

diff --git a/core/script_language.cpp b/core/script_language.cpp
index aeb157384..bb99e0aba 100644
--- a/core/script_language.cpp
+++ b/core/script_language.cpp
@@ -280,8 +280,23 @@ ScriptDebugger::ScriptDebugger() {
 bool PlaceHolderScriptInstance::set(const StringName &p_name, const Variant &p_value) {
 
 	if (values.has(p_name)) {
+		Variant defval;
+		if (script->get_property_default_value(p_name, defval)) {
+			if (defval == p_value) {
+				values.erase(p_name);
+				return true;
+			}
+		}
 		values[p_name] = p_value;
 		return true;
+	} else {
+		Variant defval;
+		if (script->get_property_default_value(p_name, defval)) {
+			if (defval != p_value) {
+				values[p_name] = p_value;
+			}
+			return true;
+		}
 	}
 	return false;
 }
@@ -291,12 +306,22 @@ bool PlaceHolderScriptInstance::get(const StringName &p_name, Variant &r_ret) co
 		r_ret = values[p_name];
 		return true;
 	}
+
+	Variant defval;
+	if (script->get_property_default_value(p_name, defval)) {
+		r_ret = defval;
+		return true;
+	}
 	return false;
 }
 
 void PlaceHolderScriptInstance::get_property_list(List<PropertyInfo> *p_properties) const {
 
 	for (const List<PropertyInfo>::Element *E = properties.front(); E; E = E->next()) {
+		PropertyInfo pinfo = E->get();
+		if (!values.has(pinfo.name)) {
+			pinfo.usage |= PROPERTY_USAGE_SCRIPT_DEFAULT_VALUE;
+		}
 		p_properties->push_back(E->get());
 	}
 }
@@ -336,6 +361,14 @@ void PlaceHolderScriptInstance::update(const List<PropertyInfo> &p_properties, c
 
 		if (!new_values.has(E->key()))
 			to_remove.push_back(E->key());
+
+		Variant defval;
+		if (script->get_property_default_value(E->key(), defval)) {
+			//remove because it's the same as the default value
+			if (defval == E->get()) {
+				to_remove.push_back(E->key());
+			}
+		}
 	}
 
 	while (to_remove.size()) {
-- 
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