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Excel's Next Corner of Selection (Ctrl+., Control+. on a Mac) moves the active cell clockwise to the next corner of the selected area (top-left, top-right, bottom-right, bottom-left) and keeps the area selected; the new active cell is also the anchor, so Shift+arrows then move the opposite corner. GridCraft had no such command. New command selection.nextCorner (Selection::next_corner) bound to Ctrl+. on every platform. A one-row or one-column area goes end to end; a single cell stays where it is. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>