From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Thu, 12 Apr 2012 22:33:28 +0000 (+0200)
Subject: Fix click-click sweep promotions to empty square
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=8f331d8de1bad648f7a7069b8d0da3697f723e3d;p=xboard.git

Fix click-click sweep promotions to empty square

These did not work, because DragPieceBegin would fail on an EmptySquare.
---

diff --git a/backend.c b/backend.c
index bd2a2c7..a2ff648 100644
--- a/backend.c
+++ b/backend.c
@@ -7190,7 +7190,10 @@ LeftClick (ClickType clickType, int xPix, int yPix)
 	if(HasPromotionChoice(fromX, fromY, toX, toY, &promoChoice, FALSE)) {
 	  if(appData.sweepSelect) {
 	    ChessSquare piece = boards[currentMove][fromY][fromX];
+	    ChessSquare victim = boards[currentMove][toY][toX];
+	    boards[currentMove][toY][toX] = piece; // kludge: make sure there is something to grab for drag
 	    DragPieceBegin(xPix, yPix, TRUE); dragging = 1;
+	    boards[currentMove][toY][toX] = victim;
 	    promoSweep = defaultPromoChoice;
 	    if(PieceToChar(PROMOTED piece) == '+') promoSweep = PROMOTED piece;
 	    selectFlag = 0; lastX = xPix; lastY = yPix;