From 6dcfa9a06338057e8f9422f84b49a758b2e49ed6 Mon Sep 17 00:00:00 2001
From: yexo <yexo@openttd.org>
Date: Mon, 4 Jan 2010 22:26:25 +0000
Subject: [PATCH] (svn r18728) -Fix: don't mark all tiles dirty in the artic
 tileloop

---
 src/clear_cmd.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/clear_cmd.cpp b/src/clear_cmd.cpp
index 2e157ffcf5..461cf4368b 100644
--- a/src/clear_cmd.cpp
+++ b/src/clear_cmd.cpp
@@ -177,7 +177,8 @@ static void TileLoopClearAlps(TileIndex tile)
 		AddClearDensity(tile, -1);
 	} else {
 		/* Density at the required level. */
-		if (k < 0) ClearSnow(tile);
+		if (k >= 0) return;
+		ClearSnow(tile);
 	}
 	MarkTileDirtyByTile(tile);
 }