Add PROPERTY_USAGE_NEVER_DUPLICATE flag and use for script

Co-authored-by: Yakov Borevich <j.borevich@gmail.com>

4 files changed, 12 insertions, 10 deletions

diff --git a/core/core_constants.cpp b/core/core_constants.cpp
index 2da693dd98..b1f56539e5 100644
--- a/core/core_constants.cpp
+++ b/core/core_constants.cpp
@@ -587,6 +587,7 @@ void register_global_constants() {
 	BIND_CORE_BITFIELD_FLAG(PROPERTY_USAGE_NIL_IS_VARIANT);
 	BIND_CORE_BITFIELD_FLAG(PROPERTY_USAGE_ARRAY);
 	BIND_CORE_BITFIELD_FLAG(PROPERTY_USAGE_ALWAYS_DUPLICATE);
+	BIND_CORE_BITFIELD_FLAG(PROPERTY_USAGE_NEVER_DUPLICATE);
 	BIND_CORE_BITFIELD_FLAG(PROPERTY_USAGE_HIGH_END_GFX);
 	BIND_CORE_BITFIELD_FLAG(PROPERTY_USAGE_NODE_PATH_FROM_SCENE_ROOT);
 	BIND_CORE_BITFIELD_FLAG(PROPERTY_USAGE_RESOURCE_NOT_PERSISTENT);
diff --git a/core/io/resource.cpp b/core/io/resource.cpp
index 022e34ecc6..e44bbc246b 100644
--- a/core/io/resource.cpp
+++ b/core/io/resource.cpp
@@ -262,7 +262,7 @@ Ref<Resource> Resource::duplicate(bool p_subresources) const {
 
 		if ((p.get_type() == Variant::DICTIONARY || p.get_type() == Variant::ARRAY)) {
 			r->set(E.name, p.duplicate(p_subresources));
-		} else if (p.get_type() == Variant::OBJECT && (p_subresources || (E.usage & PROPERTY_USAGE_ALWAYS_DUPLICATE))) {
+		} else if (p.get_type() == Variant::OBJECT && !(E.usage & PROPERTY_USAGE_NEVER_DUPLICATE) && (p_subresources || (E.usage & PROPERTY_USAGE_ALWAYS_DUPLICATE))) {
 			Ref<Resource> sr = p;
 			if (sr.is_valid()) {
 				r->set(E.name, sr->duplicate(p_subresources));
diff --git a/core/object/object.cpp b/core/object/object.cpp
index 2cb56dfe6c..a8b9e00c96 100644
--- a/core/object/object.cpp
+++ b/core/object/object.cpp
@@ -499,7 +499,7 @@ void Object::get_property_list(List<PropertyInfo> *p_list, bool p_reversed) cons
 	_get_property_listv(p_list, p_reversed);
 
 	if (!is_class("Script")) { // can still be set, but this is for user-friendliness
-		p_list->push_back(PropertyInfo(Variant::OBJECT, "script", PROPERTY_HINT_RESOURCE_TYPE, "Script", PROPERTY_USAGE_DEFAULT));
+		p_list->push_back(PropertyInfo(Variant::OBJECT, "script", PROPERTY_HINT_RESOURCE_TYPE, "Script", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_NEVER_DUPLICATE));
 	}
 
 	if (script_instance && !p_reversed) {
diff --git a/core/object/object.h b/core/object/object.h
index 92a8decb68..ec77da4ee1 100644
--- a/core/object/object.h
+++ b/core/object/object.h
@@ -110,14 +110,15 @@ enum PropertyUsageFlags {
 	PROPERTY_USAGE_NIL_IS_VARIANT = 1 << 17,
 	PROPERTY_USAGE_ARRAY = 1 << 18, // Used in the inspector to group properties as elements of an array.
 	PROPERTY_USAGE_ALWAYS_DUPLICATE = 1 << 19, // When duplicating a resource, always duplicate, even with subresource duplication disabled.
-	PROPERTY_USAGE_HIGH_END_GFX = 1 << 20,
-	PROPERTY_USAGE_NODE_PATH_FROM_SCENE_ROOT = 1 << 21,
-	PROPERTY_USAGE_RESOURCE_NOT_PERSISTENT = 1 << 22,
-	PROPERTY_USAGE_KEYING_INCREMENTS = 1 << 23, // Used in inspector to increment property when keyed in animation player.
-	PROPERTY_USAGE_DEFERRED_SET_RESOURCE = 1 << 24, // when loading, the resource for this property can be set at the end of loading.
-	PROPERTY_USAGE_EDITOR_INSTANTIATE_OBJECT = 1 << 25, // For Object properties, instantiate them when creating in editor.
-	PROPERTY_USAGE_EDITOR_BASIC_SETTING = 1 << 26, //for project or editor settings, show when basic settings are selected.
-	PROPERTY_USAGE_READ_ONLY = 1 << 27, // Mark a property as read-only in the inspector.
+	PROPERTY_USAGE_NEVER_DUPLICATE = 1 << 20, // When duplicating a resource, never duplicate, even with subresource duplication enabled.
+	PROPERTY_USAGE_HIGH_END_GFX = 1 << 21,
+	PROPERTY_USAGE_NODE_PATH_FROM_SCENE_ROOT = 1 << 22,
+	PROPERTY_USAGE_RESOURCE_NOT_PERSISTENT = 1 << 23,
+	PROPERTY_USAGE_KEYING_INCREMENTS = 1 << 24, // Used in inspector to increment property when keyed in animation player.
+	PROPERTY_USAGE_DEFERRED_SET_RESOURCE = 1 << 25, // when loading, the resource for this property can be set at the end of loading.
+	PROPERTY_USAGE_EDITOR_INSTANTIATE_OBJECT = 1 << 26, // For Object properties, instantiate them when creating in editor.
+	PROPERTY_USAGE_EDITOR_BASIC_SETTING = 1 << 27, //for project or editor settings, show when basic settings are selected.
+	PROPERTY_USAGE_READ_ONLY = 1 << 28, // Mark a property as read-only in the inspector.
 
 	PROPERTY_USAGE_DEFAULT = PROPERTY_USAGE_STORAGE | PROPERTY_USAGE_EDITOR,
 	PROPERTY_USAGE_NO_EDITOR = PROPERTY_USAGE_STORAGE,