create empty script when editor becomes visible without open files (bug #41347) * file-editor.cc (empty_script): new function determining whether to create an empty script or not; (handle_visibility): reimplemented from octave_dock_widget, calls empty_script each time the editor becomes visible; * file-editor.h: new slot handle_visibility, new function empty_script * file-editor-interface.h: new virtual function empty_script * main-window.cc (connect_visibility_changed): call empty_script when main window and all widgets are initialized

--- a/libgui/src/main-window.cc
+++ b/libgui/src/main-window.cc
@@ -1010,6 +1010,9 @@
 {
   foreach (octave_dock_widget *widget, dock_widget_list ())
     widget->connect_visibility_changed ();
+
+  // Main window completely shown, determine whether to create an empty script
+  editor_window->empty_script (true, false);
 }
 
 void