From 9abb07efb4c2a3ef1f3911fa50eb4fc46e1a16de Mon Sep 17 00:00:00 2001
From: kobewi <kobewi4e@gmail.com>
Date: Thu, 4 Nov 2021 14:30:04 +0100
Subject: Ignore external editor for built-in scripts

---
 editor/editor_node.cpp                  | 3 ++-
 editor/plugins/script_editor_plugin.cpp | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/editor/editor_node.cpp b/editor/editor_node.cpp
index a7b8a25186..d855085719 100644
--- a/editor/editor_node.cpp
+++ b/editor/editor_node.cpp
@@ -2256,7 +2256,8 @@ void EditorNode::_edit_current() {
 
 		if (main_plugin) {
 			// special case if use of external editor is true
-			if (main_plugin->get_name() == "Script" && current_obj->get_class_name() != StringName("VisualScript") && (bool(EditorSettings::get_singleton()->get("text_editor/external/use_external_editor")) || overrides_external_editor(current_obj))) {
+			Resource *res = Object::cast_to<Resource>(current_obj);
+			if (main_plugin->get_name() == "Script" && current_obj->get_class_name() != StringName("VisualScript") && res && !res->is_built_in() && (bool(EditorSettings::get_singleton()->get("text_editor/external/use_external_editor")) || overrides_external_editor(current_obj))) {
 				if (!changing_scene) {
 					main_plugin->edit(current_obj);
 				}
diff --git a/editor/plugins/script_editor_plugin.cpp b/editor/plugins/script_editor_plugin.cpp
index 4a73d1a614..aad378ecec 100644
--- a/editor/plugins/script_editor_plugin.cpp
+++ b/editor/plugins/script_editor_plugin.cpp
@@ -2174,9 +2174,10 @@ bool ScriptEditor::edit(const RES &p_resource, int p_line, int p_col, bool p_gra
 	Ref<Script> script = p_resource;
 
 	// Don't open dominant script if using an external editor.
-	const bool use_external_editor =
+	bool use_external_editor =
 			EditorSettings::get_singleton()->get("text_editor/external/use_external_editor") ||
 			(script.is_valid() && script->get_language()->overrides_external_editor());
+	use_external_editor = use_external_editor && !(script.is_valid() && script->is_built_in()); // Ignore external editor for built-in scripts.
 	const bool open_dominant = EditorSettings::get_singleton()->get("text_editor/behavior/files/open_dominant_script_on_scene_change");
 
 	const bool should_open = (open_dominant && !use_external_editor) || !EditorNode::get_singleton()->is_changing_scene();
@@ -3340,9 +3341,10 @@ Array ScriptEditor::_get_open_script_editors() const {
 
 void ScriptEditor::set_scene_root_script(Ref<Script> p_script) {
 	// Don't open dominant script if using an external editor.
-	const bool use_external_editor =
+	bool use_external_editor =
 			EditorSettings::get_singleton()->get("text_editor/external/use_external_editor") ||
 			(p_script.is_valid() && p_script->get_language()->overrides_external_editor());
+	use_external_editor = use_external_editor && !(p_script.is_valid() && p_script->is_built_in()); // Ignore external editor for built-in scripts.
 	const bool open_dominant = EditorSettings::get_singleton()->get("text_editor/behavior/files/open_dominant_script_on_scene_change");
 
 	if (open_dominant && !use_external_editor && p_script.is_valid()) {
-- 
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