(svn r11843) -Fix: mark dirty canal tile even in diagonal direction from flooded tile

src/direction_type.h

@@ -30,6 +30,9 @@ enum Direction {
 	INVALID_DIR = 0xFF,     ///< Flag for an invalid direction
 };
 
+/** Allow incrementing of Direction variables */
+DECLARE_POSTFIX_INCREMENT(Direction);
+
 /** Define basic enum properties */
 template <> struct EnumPropsT<Direction> : MakeEnumPropsT<Direction, byte, DIR_BEGIN, DIR_END, INVALID_DIR> {};
 typedef TinyEnumT<Direction> DirectionByte; //typedefing-enumification of Direction
@@ -77,6 +80,7 @@ enum DiagDirection {
 	INVALID_DIAGDIR = 0xFF, ///< Flag for an invalid DiagDirection
 };
 
+/** Allow incrementing of DiagDirection variables */
 DECLARE_POSTFIX_INCREMENT(DiagDirection);
 
 /** Define basic enum properties */

src/water_cmd.cpp

@@ -644,10 +644,9 @@ static void TileLoopWaterHelper(TileIndex tile, const TileIndexDiffC *offs)
 			MakeWater(target);
 			MarkTileDirtyByTile(target);
 			/* Mark surrounding canal tiles dirty too to avoid glitches */
-			MarkTileDirtyIfCanal(target + TileDiffXY(0, 1));
-			MarkTileDirtyIfCanal(target + TileDiffXY(1, 0));
-			MarkTileDirtyIfCanal(target + TileDiffXY(0, -1));
-			MarkTileDirtyIfCanal(target + TileDiffXY(-1, 0));
+			for (Direction dir = DIR_BEGIN; dir < DIR_END; dir++) {
+				MarkTileDirtyIfCanal(target + TileOffsByDir(dir));
+			}
 		}
 	}
 }