only update file browser and dir selection box when on top-level (bug #44622) * main-window.cc (change_directory_callback): call function for updating gui * octave-qt-link.cc (octave_qt_link): init new variables _current_directory and _new_dir; (do_change_directory): only store current dir and new state, no gui update; (update_directory): new function updating gui and clearing new dir state; (do_set_workspace): when on top level and new dir state, update gui * octave-qt-link.h: new update function, new variables for dir and state

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