This changes the meaning of the word-separators option - setting it to
the empty string is equivalent to the previous behavior. From Will Noble
in GitHub issue 2693.
- Fix word and word-end for wrapped lines.
- Fix copying of selection end on wrapped lines.
- Fix wrapped word selection edge case.
- Update select-line to respect wrapped lines.
- Update window_copy_..._pos() functions to use grid_reader.
GitHub issue 2605.