getCodepointAt
Returns the display/base codepoint at [col, row].
Plain cells return their stored Unicode scalar value.
Cluster cells return the leading codepoint of the grapheme sequence.
Wide-character spacer cells return
-1.Blank cells and out-of-bounds probes return
0.
Return
The codepoint at the specified coordinate, or a sentinel/spacer value.
Parameters
col
Column index (0-based).
row
Row index (0-based).