simplify initialization of gui dock widgets * file-editor.cc (handle_visibility): call common part of this slot instead of repeating its contents here * main-window.cc (main_window): do not connect visibility changed signal from dock widgets since this is done in the dock widget constructors; instead emit new signal for initialization of the window menu and setup editor shortcuts (connect_visibility_changed): removed obsolete method * main-window.h: new signal init_window_menu, removed method connect_visibility_changed * octave-dock-widget.cc (octave_dock_widget): rename slot for visibilityChanged signal, connect new slot for initialization of the window menu (connect_visibility_changed): remove obsolete method; (init_window_menu_entry): new slot for dis/enabling related menu window entry; (handle_visibility): combine contents from former two slots * octave-dock-widget.h: removed slot connect_visibility_changed, new signal init_window_menu_entry, removed slot handle_visibility_changed

--- a/libgui/src/m-editor/file-editor.cc	Fri Dec 18 16:16:53 2020 -0800
+++ b/libgui/src/m-editor/file-editor.cc	Sat Dec 19 10:49:43 2020 +0100
@@ -1408,6 +1408,8 @@
   // files and is made visible.
   void file_editor::handle_visibility (bool visible)
   {
+    octave_dock_widget::handle_visibility (visible);
+
     if (m_closed && visible)
       {
         m_closed = false;
@@ -1417,9 +1419,6 @@
       }
 
     empty_script (false, visible);
-
-    if (visible && ! isFloating ())
-      setFocus ();
   }
 
   // This slot is a reimplementation of the virtual slot in octave_dock_widget.