eliminate separate cli_qobject and gui_qobject classes * octave-qobject.h, octave-qobject.cc (base_qobject::m_main_window): New data member. (base_qobject::base_qobject): New arg, GUI_APP. If true, set up GUI app main main_window object, signals, and set gui_running flag to true in application context. Otherwise, set up for CLI app. Start main thread after all other objects are constructed. (base_qobject::~base_qobject): Delete m_main_window. (base_qobject::confirm_shutdown): Ask for confirmation from main_window if it exists. (class cli_qobject, class gui_qobject): Delete. * qt-application.cc (qt_application::execute): Pass result of calling start_gui_p to base_qobject constructor instead of using separate objects for gui and cli interfaces.

--- a/libgui/src/qt-application.cc	Thu Dec 03 12:28:59 2020 -0500
+++ b/libgui/src/qt-application.cc	Thu Dec 03 10:02:08 2020 -0500
@@ -62,15 +62,8 @@
 
     // Create and show main window.
 
-    if (start_gui_p ())
-      {
-        gui_qobject gui_interface (*this);
-        return gui_interface.exec ();
-      }
-    else
-      {
-        cli_qobject cli_interface (*this);
-        return cli_interface.exec ();
-      }
+    base_qobject qt_interface (*this, start_gui_p ());
+
+    return qt_interface.exec ();
   }
 }