- const int chunk = MIN (MAX_LONG_STRING, sv->width - ofs);
- memcpy (case_data_rw (c, sv->fv)->s + ofs, bounce_cur, chunk);
+ const int chunk = MIN (MIN_VERY_LONG_STRING - 1,
+ sv->width - ofs);
+ memcpy (case_data_rw_idx (c, sv->fv)->s + ofs,
+ bounce_cur, chunk);