4 files changed, 36 insertions, 8 deletions

diff --git a/core/config/engine.cpp b/core/config/engine.cpp
index 495670bc88..d8fbb50a75 100644
--- a/core/config/engine.cpp
+++ b/core/config/engine.cpp
@@ -199,17 +199,41 @@ bool Engine::is_printing_error_messages() const {
 }
 
 void Engine::add_singleton(const Singleton &p_singleton) {
+	ERR_FAIL_COND_MSG(singleton_ptrs.has(p_singleton.name), "Can't register singleton that already exists: " + String(p_singleton.name));
 	singletons.push_back(p_singleton);
 	singleton_ptrs[p_singleton.name] = p_singleton.ptr;
 }
 
-Object *Engine::get_singleton_object(const String &p_name) const {
+Object *Engine::get_singleton_object(const StringName &p_name) const {
 	const Map<StringName, Object *>::Element *E = singleton_ptrs.find(p_name);
-	ERR_FAIL_COND_V_MSG(!E, nullptr, "Failed to retrieve non-existent singleton '" + p_name + "'.");
+	ERR_FAIL_COND_V_MSG(!E, nullptr, "Failed to retrieve non-existent singleton '" + String(p_name) + "'.");
 	return E->get();
 }
 
-bool Engine::has_singleton(const String &p_name) const {
+bool Engine::is_singleton_user_created(const StringName &p_name) const {
+	ERR_FAIL_COND_V(!singleton_ptrs.has(p_name), false);
+
+	for (const Singleton &E : singletons) {
+		if (E.name == p_name && E.user_created) {
+			return true;
+		}
+	}
+
+	return false;
+}
+void Engine::remove_singleton(const StringName &p_name) {
+	ERR_FAIL_COND(!singleton_ptrs.has(p_name));
+
+	for (List<Singleton>::Element *E = singletons.front(); E; E = E->next()) {
+		if (E->get().name == p_name) {
+			singletons.erase(E);
+			singleton_ptrs.erase(p_name);
+			return;
+		}
+	}
+}
+
+bool Engine::has_singleton(const StringName &p_name) const {
 	return singleton_ptrs.has(p_name);
 }
 
diff --git a/core/config/engine.h b/core/config/engine.h
index e6b5df2d5a..ae33acede2 100644
--- a/core/config/engine.h
+++ b/core/config/engine.h
@@ -42,6 +42,7 @@ public:
 		StringName name;
 		Object *ptr;
 		StringName class_name; //used for binding generation hinting
+		bool user_created = false;
 		Singleton(const StringName &p_name = StringName(), Object *p_ptr = nullptr, const StringName &p_class_name = StringName());
 	};
 
@@ -109,8 +110,10 @@ public:
 
 	void add_singleton(const Singleton &p_singleton);
 	void get_singletons(List<Singleton> *p_singletons);
-	bool has_singleton(const String &p_name) const;
-	Object *get_singleton_object(const String &p_name) const;
+	bool has_singleton(const StringName &p_name) const;
+	Object *get_singleton_object(const StringName &p_name) const;
+	void remove_singleton(const StringName &p_name);
+	bool is_singleton_user_created(const StringName &p_name) const;
 
 #ifdef TOOLS_ENABLED
 	_FORCE_INLINE_ void set_editor_hint(bool p_enabled) { editor_hint = p_enabled; }
diff --git a/core/config/project_settings.cpp b/core/config/project_settings.cpp
index c5e6c6d685..03892d1d4f 100644
--- a/core/config/project_settings.cpp
+++ b/core/config/project_settings.cpp
@@ -1006,7 +1006,7 @@ bool ProjectSettings::has_custom_feature(const String &p_feature) const {
 	return custom_features.has(p_feature);
 }
 
-Map<StringName, ProjectSettings::AutoloadInfo> ProjectSettings::get_autoload_list() const {
+OrderedHashMap<StringName, ProjectSettings::AutoloadInfo> ProjectSettings::get_autoload_list() const {
 	return autoloads;
 }
 
diff --git a/core/config/project_settings.h b/core/config/project_settings.h
index ed8fb19fa0..7e93f26f0d 100644
--- a/core/config/project_settings.h
+++ b/core/config/project_settings.h
@@ -33,6 +33,7 @@
 
 #include "core/object/class_db.h"
 #include "core/os/thread_safe.h"
+#include "core/templates/ordered_hash_map.h"
 #include "core/templates/set.h"
 
 class ProjectSettings : public Object {
@@ -91,7 +92,7 @@ protected:
 	Set<String> custom_features;
 	Map<StringName, StringName> feature_overrides;
 
-	Map<StringName, AutoloadInfo> autoloads;
+	OrderedHashMap<StringName, AutoloadInfo> autoloads;
 
 	bool _set(const StringName &p_name, const Variant &p_value);
 	bool _get(const StringName &p_name, Variant &r_ret) const;
@@ -168,7 +169,7 @@ public:
 
 	bool has_custom_feature(const String &p_feature) const;
 
-	Map<StringName, AutoloadInfo> get_autoload_list() const;
+	OrderedHashMap<StringName, AutoloadInfo> get_autoload_list() const;
 	void add_autoload(const AutoloadInfo &p_autoload);
 	void remove_autoload(const StringName &p_autoload);
 	bool has_autoload(const StringName &p_autoload) const;