From a77d71269906ce8480c66635f4ce12e48f1fc51e Mon Sep 17 00:00:00 2001
From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Mon, 2 Apr 2012 17:53:40 +0200
Subject: [PATCH] Use Ctrl key in EditPosition mode to copy pieces

---
 backend.c  |    5 +++--
 dialogs.c  |    4 +++-
 frontend.h |    2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/backend.c b/backend.c
index 38c3533..6185347 100644
--- a/backend.c
+++ b/backend.c
@@ -450,7 +450,7 @@ int adjudicateLossPlies = 6;
 char white_holding[64], black_holding[64];
 TimeMark lastNodeCountTime;
 long lastNodeCount=0;
-int shiftKey; // [HGM] set by mouse handler
+int shiftKey, controlKey; // [HGM] set by mouse handler
 
 int have_sent_ICS_logon = 0;
 int movesPerSession;
@@ -6664,7 +6664,7 @@ UserMoveEvent(int fromX, int fromY, int toX, int toY, int promoChar)
 		    if(boards[0][fromY][BOARD_WIDTH-2] == 0)  boards[0][fromY][BOARD_WIDTH-1] = EmptySquare;
 		}
 	    } else
-	    boards[0][fromY][fromX] = EmptySquare;
+	    boards[0][fromY][fromX] = gatingPiece;
 	    DrawPosition(FALSE, boards[currentMove]);
 	    return;
 	}
@@ -7060,6 +7060,7 @@ LeftClick (ClickType clickType, int xPix, int yPix)
 	    if (OKToStartUserMove(fromX, fromY)) {
 		second = 0;
 		MarkTargetSquares(0);
+		if(gameMode == EditPosition && controlKey) gatingPiece = boards[currentMove][fromY][fromX];
 		DragPieceBegin(xPix, yPix, FALSE); dragging = 1;
 		if(appData.sweepSelect && CanPromote(piece = boards[currentMove][fromY][fromX], fromY)) {
 		    promoSweep = defaultPromoChoice;
diff --git a/dialogs.c b/dialogs.c
index b6abd82..a6698ca 100644
--- a/dialogs.c
+++ b/dialogs.c
@@ -1909,7 +1909,9 @@ Exp (int n, int x, int y)
 	if(but3) MovePV(x, y, lineGap + BOARD_HEIGHT * (squareSize + lineGap));
 	return NULL;
     }
-    shiftKey = (ShiftKeys() & 3) != 0;
+    shiftKey = ShiftKeys();
+    controlKey = (shiftKey & 0xC) != 0;
+    shiftKey = (shiftKey & 3) != 0;
     switch(n) {
 	case  1: LeftClick(Press,   x, y), but1 = 1; break;
 	case -1: LeftClick(Release, x, y), but1 = 0; break;
diff --git a/frontend.h b/frontend.h
index 4cad55a..33496d4 100644
--- a/frontend.h
+++ b/frontend.h
@@ -170,7 +170,7 @@ void CmailSigHandlerCallBack P((InputSourceRef isr, VOIDSTAR closure,
 				char *buf, int count, int error));
 
 extern ProcRef cmailPR;
-extern int shiftKey;
+extern int shiftKey, controlKey;
 
 /* in xgamelist.c or winboard.c */
 void GLT_ClearList();
-- 
1.7.0.4