Optimized ScriptEditor initialization when many scripts are loaded

This change avoids the editor to freeze for several seconds when a
project with lots of scripts is loaded in the editor.

It focuses on a few heavy operations previously executed on all
previously loaded scripts:
- Initialize script resource (script validation/parsing) only
on focus
- ScriptTextEditor: code editor and edit menu are added to the
scene only on focus
- Add to recent scripts only when opening new scripts
(load/save scene metadata)

2 files changed, 6 insertions, 0 deletions

diff --git a/modules/visual_script/visual_script_editor.cpp b/modules/visual_script/visual_script_editor.cpp
index 2fcd9332a1..a1c7dca9d2 100644
--- a/modules/visual_script/visual_script_editor.cpp
+++ b/modules/visual_script/visual_script_editor.cpp
@@ -2513,6 +2513,8 @@ RES VisualScriptEditor::get_edited_resource() const {
 }
 
 void VisualScriptEditor::set_edited_resource(const RES &p_res) {
+	ERR_FAIL_COND(script.is_valid());
+	ERR_FAIL_COND(p_res.is_null());
 	script = p_res;
 	signal_editor->script = script;
 	signal_editor->undo_redo = undo_redo;
@@ -2533,6 +2535,9 @@ void VisualScriptEditor::set_edited_resource(const RES &p_res) {
 	_update_members();
 }
 
+void VisualScriptEditor::enable_editor() {
+}
+
 Vector<String> VisualScriptEditor::get_functions() {
 	return Vector<String>();
 }
diff --git a/modules/visual_script/visual_script_editor.h b/modules/visual_script/visual_script_editor.h
index e59618e120..0c5665cee8 100644
--- a/modules/visual_script/visual_script_editor.h
+++ b/modules/visual_script/visual_script_editor.h
@@ -294,6 +294,7 @@ public:
 	virtual void apply_code() override;
 	virtual RES get_edited_resource() const override;
 	virtual void set_edited_resource(const RES &p_res) override;
+	virtual void enable_editor() override;
 	virtual Vector<String> get_functions() override;
 	virtual void reload_text() override;
 	virtual String get_name() override;