From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Sun, 28 Feb 2016 11:01:40 +0000 (+0100)
Subject: Fix disappearance of premoved piece
X-Git-Url: http://winboard.nl/cgi-bin?p=xboard.git;a=commitdiff_plain;h=0c319b0184e2b431cbf381096e1849f23053cad6

Fix disappearance of premoved piece

When a premove was done by dragging, (which for expected recaptures would
be the only way, as click-click moving selects the intended target),
the moved piece would disappear from view. This because the from-square
would not be redrawn (in normal move execution it would remain empty).
This could have been an XBoard-only problem. In any case We now force a
complete redraw of the board, which is not very elegant, but should always
fix it.
---

diff --git a/backend.c b/backend.c
index 0624dac..7243ee7 100644
--- a/backend.c
+++ b/backend.c
@@ -7051,6 +7051,7 @@ UserMoveEvent (int fromX, int fromY, int toX, int toY, int promoChar)
 			    "fromY %d, toX %d, toY %d\n",
 			    fromX, fromY, toX, toY);
 	    }
+            DrawPosition(TRUE, boards[currentMove]); // [HGM] repair animation damage done by premove (in particular emptying from-square)
             return;
 	}
 	break;
@@ -7072,6 +7073,7 @@ UserMoveEvent (int fromX, int fromY, int toX, int toY, int promoChar)
 			    "fromY %d, toX %d, toY %d\n",
 			    fromX, fromY, toX, toY);
 	    }
+            DrawPosition(TRUE, boards[currentMove]);
             return;
 	}
 	break;