Fix exposing of premove highlight and move exclusion XB

Now that drawHighlights does not trigger an expose event itself, it is
essiential that DrawPosition is called after every SetPremoveHighlight()
call. But it wasn't after entering a premove, and after a drag-drop move
exclusion the old position was not redrawn at all, leaving the dragged
piece 'floating'.

diff --git a/backend.c b/backend.c
index d879de7..f736023 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -7168,6 +7168,7 @@ UserMoveEvent (int fromX, int fromY, int toX, int toY, int promoChar)
         if(ExcludeOneMove(fromY, fromX, toY, toX, promoChar, '*')) // toggle
             ClearPremoveHighlights(); // was included
        else ClearHighlights(), SetPremoveHighlights(ff, rf, ft, rt); // exclusion indicated  by premove highlights
+       DrawPosition(FALSE, NULL);
        return;
     }
 
@@ -7911,7 +7912,7 @@ LeftClick (ClickType clickType, int xPix, int yPix)
        flashing = 1; // prevent recursive calling (by release of to-click) while flashing piece
        UserMoveEvent(fromX, fromY, toX, toY, promoChoice);
        if (!appData.highlightLastMove || gotPremove) ClearHighlights();
-       if (gotPremove) SetPremoveHighlights(fromX, fromY, toX, toY);
+       if (gotPremove) SetPremoveHighlights(fromX, fromY, toX, toY), DrawPosition(FALSE, NULL);
        if(saveAnimate && !appData.animate && currentMove != oldMove && // drag-move was performed
           Explode(boards[currentMove-1], fromX, fromY, toX, toY))
            DrawPosition(TRUE, boards[currentMove]);