'Returns first 150 characters of annotation.'

def get_value(self, trans, grid, item):

    annotation = self.get_item_annotation_str(trans.sa_session, item.user, item)
    if annotation:
        ann_snippet = annotation[:155]
        if (len(annotation) > 155):
            ann_snippet = ann_snippet[:ann_snippet.rfind('    ')]
            ann_snippet += '...'
    else:
        ann_snippet = ''
    return escape(ann_snippet)
