Fix deselection of piece

The patch to allow entering of friendly capture (intended as a kludge
for entering non-standard castling) had broken the ability to change
the selected piece by clicking another piece, as this was now always
interpreted as a friendly capture (which was then rejected as illegal).
By testing marker[][] in stead of legal[][] this can be avoided; legal[][]
was not a good measure, because in absence of a highlight command it
is completely filled with 1, to make everything legal. No friendly squares
will ever get marked unless a highlight command does it, though.

diff --git a/backend.c b/backend.c
index 7747844..5b66016 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -7519,7 +7519,7 @@ printf("to click %d,%d\n",x,y);
        toP = boards[currentMove][y][x];
        frc = appData.fischerCastling || gameInfo.variant == VariantSChess;
        if( (killX < 0 || x != fromX || y != fromY) && // [HGM] lion: do not interpret igui as deselect!
-           legal[y][x] == 0 && // if engine told we can move to here, do it even if own piece
+           marker[y][x] == 0 && // if engine told we can move to here, do it even if own piece
           ((WhitePawn <= fromP && fromP <= WhiteKing &&
             WhitePawn <= toP && toP <= WhiteKing &&
             !(fromP == WhiteKing && toP == WhiteRook && frc) &&