From 08af3b38d923f7234c1ce628dedaa3eacb86a9e7 Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Thu, 20 Feb 2020 00:38:01 +0000
Subject: [PATCH] Do not mark map-mode viewports dirty when changing rail
 ground type

---
 src/rail_cmd.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
index 817719e19f..44600cc3a5 100644
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -1017,7 +1017,7 @@ bool FloodHalftile(TileIndex t)
 			if (IsSteepSlope(tileh) || IsSlopeWithThreeCornersRaised(tileh)) {
 				flooded = true;
 				SetRailGroundType(t, RAIL_GROUND_WATER);
-				MarkTileDirtyByTile(t);
+				MarkTileDirtyByTile(t, ZOOM_LVL_DRAW_MAP);
 			}
 		}
 	}
@@ -3327,7 +3327,7 @@ static void TileLoop_Track(TileIndex tile)
 set_ground:
 	if (old_ground != new_ground) {
 		SetRailGroundType(tile, new_ground);
-		MarkTileDirtyByTile(tile);
+		MarkTileDirtyByTile(tile, ZOOM_LVL_DRAW_MAP);
 	}
 }