add functions of loaded packages to auto-completion list (bug #56207) * file-editor-tab.cc (update_lexer_settings): add boolean argument for updating apis but no other settings, clear current apis entries before adding all current functions and keywords * file-editor-tab.h: (update_lexer_settings): add boolean argument for updating apis but no other settings and define as slot * file-editor.cc (make_file_editor_tab): connect new main window signal for updating auto completion word lists with the slot in file_editor_tab * main-window.cc (construct_octave_qt_link): connect new qt-link signal for updating auto completion word lists with the related new main window signal * main-window.h: new signal for word list update * qt-interpreter-events.cc (update_gui_lexer): new method emitting signal for updateing the auto completion word list * qt-interpreter-events.h: new method update_gui_lexer and new signal update_gui_lexer_signal * event-manager.cc (__event_manager_update_gui_lexer__): new function for requesting an update of the auto completion worf lists * event-manager.h (void update_gui_lexer): new method calling the virtual methos which is re-implemented in qt event manager * load_packages_and_dependencies.m: call __event_manager_update_gui_lexer__ after laoding a package if gui is running * unload_packages.m: call __event_manager_update_gui_lexer__ after unloading a packages if gui is running

--- a/libinterp/corefcn/event-manager.cc	Wed Sep 23 21:23:32 2020 +0200
+++ b/libinterp/corefcn/event-manager.cc	Thu Sep 24 20:49:43 2020 +0200
@@ -577,6 +577,17 @@
   return ovl (evmgr.unregister_doc (file));
 }
 
+DEFMETHOD (__event_manager_update_gui_lexer__, interp, , ,
+           doc: /* -*- texinfo -*-
+@deftypefn {} {} __event_manager_update_gui_lexer__ ()
+Undocumented internal function.
+@end deftypefn */)
+{
+  octave::event_manager& evmgr = interp.get_event_manager ();
+
+  return ovl (evmgr.update_gui_lexer ());
+}
+
 DEFMETHOD (__event_manager_copy_image_to_clipboard__, interp, args, ,
            doc: /* -*- texinfo -*-
 @deftypefn {} {} __event_manager_copy_image_to_clipboard__ (@var{filename})