Fix deselection of Lion

It was not possible to select another piece after the first leg was entered,
and there could be some pathologic behavior after a rejected move because
the kill-square was not properly cleared when selecting a new piece.

diff --git a/backend.c b/backend.c
index 001f970..ea6f124 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -7309,7 +7309,7 @@ LeftClick (ClickType clickType, int xPix, int yPix)
       if(gameMode == AnalyzeMode && (pausing || controlKey) && first.excludeMoves) { // use pause state to exclude moves
        doubleClick = TRUE; gatingPiece = boards[currentMove][y][x];
       }
-      fromX = x; fromY = y; toX = toY = -1;
+      fromX = x; fromY = y; toX = toY = killX = killY = -1;
       if(!appData.oneClick || !OnlyMove(&x, &y, FALSE) ||
         // even if only move, we treat as normal when this would trigger a promotion popup, to allow sweep selection
         appData.sweepSelect && CanPromote(boards[currentMove][fromY][fromX], fromY) && originalY != y) {
@@ -7337,7 +7337,7 @@ LeftClick (ClickType clickType, int xPix, int yPix)
     }
 
     /* fromX != -1 */
-    if (clickType == Press && gameMode != EditPosition && killX < 0) {
+    if (clickType == Press && gameMode != EditPosition) {
        ChessSquare fromP;
        ChessSquare toP;
        int frc;
@@ -7349,16 +7349,18 @@ LeftClick (ClickType clickType, int xPix, int yPix)
        fromP = boards[currentMove][fromY][fromX];
        toP = boards[currentMove][y][x];
        frc = gameInfo.variant == VariantFischeRandom || gameInfo.variant == VariantCapaRandom || gameInfo.variant == VariantSChess;
-       if ((WhitePawn <= fromP && fromP <= WhiteKing &&
+       if( (killX < 0 || x != fromX || y != fromY) && // [HGM] lion: do not interpret igui as deselect!
+          ((WhitePawn <= fromP && fromP <= WhiteKing &&
             WhitePawn <= toP && toP <= WhiteKing &&
             !(fromP == WhiteKing && toP == WhiteRook && frc) &&
             !(fromP == WhiteRook && toP == WhiteKing && frc)) ||
            (BlackPawn <= fromP && fromP <= BlackKing &&
             BlackPawn <= toP && toP <= BlackKing &&
             !(fromP == BlackRook && toP == BlackKing && frc) && // allow also RxK as FRC castling
-            !(fromP == BlackKing && toP == BlackRook && frc))) {
+            !(fromP == BlackKing && toP == BlackRook && frc)))) {
            /* Clicked again on same color piece -- changed his mind */
            second = (x == fromX && y == fromY);
+           killX = killY = -1;
            if(second && gameMode == AnalyzeMode && SubtractTimeMarks(&lastClickTime, &prevClickTime) < 200) {
                second = FALSE; // first double-click rather than scond click
                doubleClick = first.excludeMoves; // used by UserMoveEvent to recognize exclude moves