Fix demoting in Edit Position mode

A click on an already selected demotable piece will now cause demotion,
rather than disappearance of that piece, similar to how clicks on a
selected promotable piece will promote it.

diff --git a/backend.c b/backend.c
index 48a625a..8545cde 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -7075,11 +7075,9 @@ UserMoveEvent(int fromX, int fromY, int toX, int toY, int promoChar)
            return;
        } else if (toX >= 0 && toY >= 0) {
            if(!appData.pieceMenu && toX == fromX && toY == fromY && boards[0][rf][ff] != EmptySquare) {
-               ChessSquare q, p = boards[0][rf][ff];
-               if(p >= BlackPawn) p = BLACK_TO_WHITE p;
-               if(CHUPROMOTED(p) < BlackPawn) p = q = CHUPROMOTED(boards[0][rf][ff]);
-               else p = CHUDEMOTED (q = boards[0][rf][ff]);
-               if(PieceToChar(q) == '+') gatingPiece = p;
+               ChessSquare p = boards[0][rf][ff];
+               if(PieceToChar(p) == '+') gatingPiece = CHUDEMOTED(p); else
+               if(PieceToChar(CHUPROMOTED(p)) =='+') gatingPiece = CHUPROMOTED(p); 
            }
            boards[0][toY][toX] = boards[0][fromY][fromX];
            if(fromX == BOARD_LEFT-2) { // handle 'moves' out of holdings