From: simon <simon@cda61777-01e9-0310-a592-d414129be87e>
Date: Sun, 25 Feb 2007 13:00:58 +0000 (+0000)
Subject: Don't create an undo-chain entry for a move with no effect.
X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/puzzles/commitdiff_plain/a33fdba7f9112f0c005be30e2b92d40db19a3346

Don't create an undo-chain entry for a move with no effect.


git-svn-id: svn://svn.tartarus.org/sgt/puzzles@7333 cda61777-01e9-0310-a592-d414129be87e
---

diff --git a/filling.c b/filling.c
index ac5b6d9..82efcca 100644
--- a/filling.c
+++ b/filling.c
@@ -962,9 +962,13 @@ static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
     {
         const int i = w*ui->y + ui->x;
         char buf[64];
-        sprintf(buf, "%d_%d", i, button);
         ui->x = ui->y = -1;
-        return dupstr(buf);
+	if (state->board[i] == button) {
+	    return "";		       /* no change - just update ui */
+	} else {
+	    sprintf(buf, "%d_%d", i, button);
+	    return dupstr(buf);
+	}
     }
 }