ref: a9af3fda1d784c42d486a019a0a4e947f762af70
parent: b08c13f5f47a8541961fc150142523b061d3d9c6
author: Ben Harris <bjh21@bjh21.me.uk>
date: Sun Jun 4 14:42:58 EDT 2023
Rename UI_UPDATE as MOVE_UI_UPDATE All the other constants named UI_* are special key names that can be passed to midend_process_key(), but UI_UPDATE is a special return value from the back-end interpret_move() function instead. This renaming makes the distinction clear and provides a naming convention for future special return values from interpret_move().