'Remove a single breakpoint'

def clear_breakpoint(self, filename, lineno):

    clear_breakpoint(filename, lineno)
    self.breakpoints_saved.emit()
    editorstack = self.get_current_editorstack()
    if (editorstack is not None):
        index = self.is_file_opened(filename)
        if (index is not None):
            editorstack.data[index].editor.add_remove_breakpoint(lineno)
