Load filename, create an editor instance and return it
        *Warning* This is loading file, creating editor but not executing
        the source code analysis -- the analysis must be done by the editor
        plugin (in case multiple editorstack instances are handled)

def load(self, filename, set_current=True, add_where='end'):
        """
        Load filename, create an editor instance and return it
        *Warning* This is loading file, creating editor but not executing
        the source code analysis -- the analysis must be done by the editor
        plugin (in case multiple editorstack instances are handled)
        """
        filename = osp.abspath(to_text_string(filename))
        self.starting_long_process.emit(_("Loading %s...") % filename)
        text, enc = encoding.read(filename)
        finfo = self.create_new_editor(filename, enc, text, set_current,
                                       add_where=add_where)
        index = self.data.index(finfo)
        self._refresh_outlineexplorer(index, update=True)
        self.ending_long_process.emit("")
        if self.isVisible() and self.checkeolchars_enabled \
           and sourcecode.has_mixed_eol_chars(text):
            name = osp.basename(filename)
            self.msgbox = QMessageBox(
                    QMessageBox.Warning,
                    self.title,
                    _("<b>%s</b> contains mixed end-of-line "
                      "characters.<br>Spyder will fix this "
                      "automatically.") % name,
                    QMessageBox.Ok,
                    self)
            self.msgbox.exec_()
            self.set_os_eol_chars(index)
        self.is_analysis_done = False
        return finfo