Better user expirence with external text editors.

Implements open_in_external_editor for subclasses of ScriptLanguage.
Add option 'Debug with external editor' to debug menu to control the behavoir of script opened by editor.

editor/plugins/script_editor_plugin.cpp

@@ -313,6 +313,13 @@ void ScriptEditor::_goto_script_line(REF p_script, int p_line) {
 
 	editor->push_item(p_script.ptr());
 
+	if (bool(EditorSettings::get_singleton()->get("text_editor/external/use_external_editor"))) {
+
+		Ref<Script> script = p_script->cast_to<Script>();
+		if (!script.is_null() && script->get_path().is_resource_file())
+			edit(p_script, p_line, 0);
+	}
+
 	int selected = tab_container->get_current_tab();
 	if (selected < 0 || selected >= tab_container->get_child_count())
 		return;
@@ -866,6 +873,11 @@ void ScriptEditor::_menu_option(int p_option) {
 				debugger->set_hide_on_stop(visible);
 			debug_menu->get_popup()->set_item_checked(debug_menu->get_popup()->get_item_index(DEBUG_SHOW_KEEP_OPEN), !visible);
 		} break;
+		case DEBUG_WITH_EXTERNAL_EDITOR: {
+			bool debug_with_external_editor = !debug_menu->get_popup()->is_item_checked(debug_menu->get_popup()->get_item_index(DEBUG_WITH_EXTERNAL_EDITOR));
+			debugger->set_debug_with_external_editor(debug_with_external_editor);
+			debug_menu->get_popup()->set_item_checked(debug_menu->get_popup()->get_item_index(DEBUG_WITH_EXTERNAL_EDITOR), debug_with_external_editor);
+		}
 	}
 
 	int selected = tab_container->get_current_tab();
@@ -1545,13 +1557,10 @@ bool ScriptEditor::edit(const Ref<Script> &p_script, int p_line, int p_col, bool
 
 	bool open_dominant = EditorSettings::get_singleton()->get("text_editor/files/open_dominant_script_on_scene_change");
 
-	Error err = p_script->get_language()->open_in_external_editor(p_script, p_line >= 0 ? p_line : 0, p_col);
-	if (err == OK)
-		return false;
-	if (err != ERR_UNAVAILABLE)
-		WARN_PRINT("Couldn't open in custom external text editor");
-
-	if (p_script->get_path().is_resource_file() && bool(EditorSettings::get_singleton()->get("text_editor/external/use_external_editor"))) {
+	if ((debugger->get_dump_stack_script() != p_script || debugger->get_debug_with_external_editor()) &&
+			p_script->get_language()->open_in_external_editor(p_script, p_line >= 0 ? p_line : 0, p_col) == OK &&
+			p_script->get_path().is_resource_file() &&
+			bool(EditorSettings::get_singleton()->get("text_editor/external/use_external_editor"))) {
 
 		String path = EditorSettings::get_singleton()->get("text_editor/external/exec_path");
 		String flags = EditorSettings::get_singleton()->get("text_editor/external/exec_flags");
@@ -2244,6 +2253,7 @@ ScriptEditor::ScriptEditor(EditorNode *p_editor) {
 	debug_menu->get_popup()->add_separator();
 	//debug_menu->get_popup()->add_check_item("Show Debugger",DEBUG_SHOW);
 	debug_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("debugger/keep_debugger_open", TTR("Keep Debugger Open")), DEBUG_SHOW_KEEP_OPEN);
+	debug_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("debugger/debug_with_exteral_editor", TTR("Debug with external editor")), DEBUG_WITH_EXTERNAL_EDITOR);
 	debug_menu->get_popup()->connect("id_pressed", this, "_menu_option");
 
 	debug_menu->get_popup()->set_item_disabled(debug_menu->get_popup()->get_item_index(DEBUG_NEXT), true);

editor/plugins/script_editor_plugin.h

@@ -141,6 +141,7 @@ class ScriptEditor : public VBoxContainer {
 		DEBUG_CONTINUE,
 		DEBUG_SHOW,
 		DEBUG_SHOW_KEEP_OPEN,
+		DEBUG_WITH_EXTERNAL_EDITOR,
 		SEARCH_HELP,
 		SEARCH_CLASSES,
 		SEARCH_WEBSITE,

editor/plugins/script_text_editor.cpp

@@ -557,6 +557,8 @@ void ScriptEditor::_update_modified_scripts_for_external_editor(Ref<Script> p_fo
 	if (!bool(EditorSettings::get_singleton()->get("text_editor/external/use_external_editor")))
 		return;
 
+	ERR_FAIL_COND(!get_tree());
+
 	Set<Ref<Script> > scripts;
 
 	Node *base = get_tree()->get_edited_scene_root();

editor/script_editor_debugger.cpp

@@ -1137,8 +1137,9 @@ void ScriptEditorDebugger::_stack_dump_frame_selected() {
 
 	Dictionary d = ti->get_metadata(0);
 
-	Ref<Script> s = ResourceLoader::load(d["file"]);
-	emit_signal("goto_script_line", s, int(d["line"]) - 1);
+	stack_script = ResourceLoader::load(d["file"]);
+	emit_signal("goto_script_line", stack_script, int(d["line"]) - 1);
+	stack_script.unref();
 
 	ERR_FAIL_COND(connection.is_null());
 	ERR_FAIL_COND(!connection->is_connected_to_host());
@@ -1522,6 +1523,21 @@ void ScriptEditorDebugger::set_hide_on_stop(bool p_hide) {
 	hide_on_stop = p_hide;
 }
 
+bool ScriptEditorDebugger::get_debug_with_external_editor() const {
+
+	return enable_external_editor;
+}
+
+void ScriptEditorDebugger::set_debug_with_external_editor(bool p_enabled) {
+
+	enable_external_editor = p_enabled;
+}
+
+Ref<Script> ScriptEditorDebugger::get_dump_stack_script() const {
+
+	return stack_script;
+}
+
 void ScriptEditorDebugger::_paused() {
 
 	ERR_FAIL_COND(connection.is_null());
@@ -1871,6 +1887,7 @@ ScriptEditorDebugger::ScriptEditorDebugger(EditorNode *p_editor) {
 	last_path_id = false;
 	error_count = 0;
 	hide_on_stop = true;
+	enable_external_editor = false;
 	last_error_count = 0;
 
 	EditorNode::get_singleton()->get_pause_button()->connect("pressed", this, "_paused");

editor/script_editor_debugger.h

@@ -84,6 +84,8 @@ class ScriptEditorDebugger : public Control {
 	int last_error_count;
 
 	bool hide_on_stop;
+	bool enable_external_editor;
+	Ref<Script> stack_script;
 
 	TabContainer *tabs;
 
@@ -201,6 +203,11 @@ public:
 
 	void set_hide_on_stop(bool p_hide);
 
+	bool get_debug_with_external_editor() const;
+	void set_debug_with_external_editor(bool p_enabled);
+
+	Ref<Script> get_dump_stack_script() const;
+
 	void set_tool_button(Button *p_tb) { debugger_button = p_tb; }
 
 	void reload_scripts();

modules/gdnative/gdnative.h

@@ -335,7 +335,7 @@ public:
 	virtual bool has_named_classes() const;
 	virtual int find_function(const String &p_function, const String &p_code) const;
 	virtual String make_function(const String &p_class, const String &p_name, const PoolStringArray &p_args) const;
-
+	virtual Error open_in_external_editor(const Ref<Script> &p_script, int p_line, int p_col) { return ERR_UNAVAILABLE; }
 	virtual Error complete_code(const String &p_code, const String &p_base_path, Object *p_owner, List<String> *r_options, String &r_call_hint) { return ERR_UNAVAILABLE; }
 
 	virtual Error lookup_code(const String &p_code, const String &p_symbol, const String &p_base_path, Object *p_owner, LookupResult &r_result) { return ERR_UNAVAILABLE; }

modules/gdscript/gd_script.h

@@ -389,6 +389,7 @@ public:
 	virtual bool can_inherit_from_file() { return true; }
 	virtual int find_function(const String &p_function, const String &p_code) const;
 	virtual String make_function(const String &p_class, const String &p_name, const PoolStringArray &p_args) const;
+	virtual Error open_in_external_editor(const Ref<Script> &p_script, int p_line, int p_col) { return OK; }
 	virtual Error complete_code(const String &p_code, const String &p_base_path, Object *p_owner, List<String> *r_options, String &r_call_hint);
 #ifdef TOOLS_ENABLED
 	virtual Error lookup_code(const String &p_code, const String &p_symbol, const String &p_base_path, Object *p_owner, LookupResult &r_result);

modules/visual_script/visual_script.h

@@ -571,6 +571,7 @@ public:
 	virtual bool has_named_classes() const;
 	virtual int find_function(const String &p_function, const String &p_code) const;
 	virtual String make_function(const String &p_class, const String &p_name, const PoolStringArray &p_args) const;
+	virtual Error open_in_external_editor(const Ref<Script> &p_script, int p_line, int p_col) { return ERR_UNAVAILABLE; }
 	virtual void auto_indent_code(String &p_code, int p_from_line, int p_to_line) const;
 	virtual void add_global_constant(const StringName &p_variable, const Variant &p_value);