Sends cursor position report.
The terminal replies with:
ESC[?Ⓝ;Ⓝ;1R
If cursor origin mode is set the cursor position is reported relative to the top left corner of the scroll area.
See request cursor position report for a more widely supported variant of the command (although that command's response conflicts with F1-key reporting).
If emulation level is below 4 the last ';1' is not included in the report.