def chdir(self, directory=None, browsing_history=False):
        """Set directory as working directory"""
        if directory is not None:
            directory = osp.abspath(to_text_string(directory))
        if browsing_history:
            directory = self.history[self.histindex]
        elif directory in self.history:
            self.histindex = self.history.index(directory)
        else:
            if self.histindex is None:
                self.history = []
            else:
                self.history = self.history[:self.histindex+1]
            if len(self.history) == 0 or \
               (self.history and self.history[-1] != directory):
                self.history.append(directory)
            self.histindex = len(self.history)-1
        directory = to_text_string(directory)
        try:
            PermissionError
            FileNotFoundError
        except NameError:
            PermissionError = OSError
            if os.name == 'nt':
                FileNotFoundError = WindowsError
            else:
                FileNotFoundError = IOError
        try:
            os.chdir(directory)
            self.sig_open_dir.emit(directory)
            self.refresh(new_path=directory, force_current=True)
        except PermissionError:
            QMessageBox.critical(self.parent_widget, "Error",
                                 _("You don't have the right permissions to "
                                   "open this directory"))
        except FileNotFoundError:
            # Handle renaming directories on the fly. See issue #5183
            self.history.pop(self.histindex)
Set directory as working directory