Merge branch 'signal_tunnels_bridges-sx' into jgrpp

Conflicts:
	src/tunnelbridge.h

(Fixup zoom level changes).

src/rail_cmd.cpp

@@ -1091,10 +1091,11 @@ CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1,
 					}
 				}
 			}
-			MarkTileDirtyByTile(tile);
-			MarkTileDirtyByTile(tile_exit);
+			MarkBridgeOrTunnelDirty(tile);
 			AddSideToSignalBuffer(tile, INVALID_DIAGDIR, GetTileOwner(tile));
+			AddSideToSignalBuffer(tile_exit, INVALID_DIAGDIR, GetTileOwner(tile));
 			YapfNotifyTrackLayoutChange(tile, track);
+			YapfNotifyTrackLayoutChange(tile_exit, track);
 		}
 		return cost;
 	}
@@ -1545,10 +1546,11 @@ CommandCost CmdRemoveSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1
 			ClrBitTunnelBridgeSignal(end);
 			_m[tile].m2 = 0;
 			_m[end].m2 = 0;
-			MarkTileDirtyByTile(tile);
-			MarkTileDirtyByTile(end);
+			MarkBridgeOrTunnelDirty(tile);
 			AddSideToSignalBuffer(tile, INVALID_DIAGDIR, GetTileOwner(tile));
+			AddSideToSignalBuffer(end, INVALID_DIAGDIR, GetTileOwner(tile));
 			YapfNotifyTrackLayoutChange(tile, track);
+			YapfNotifyTrackLayoutChange(end, track);
 			return CommandCost(EXPENSES_CONSTRUCTION, cost);
 		}
 

src/tunnelbridge.h

@@ -16,6 +16,7 @@
 
 void MarkBridgeDirty(TileIndex begin, TileIndex end, DiagDirection direction, uint bridge_height, const ZoomLevel mark_dirty_if_zoomlevel_is_below = ZOOM_LVL_END);
 void MarkBridgeDirty(TileIndex tile, const ZoomLevel mark_dirty_if_zoomlevel_is_below = ZOOM_LVL_END);
+void MarkBridgeOrTunnelDirty(TileIndex tile, const ZoomLevel mark_dirty_if_zoomlevel_is_below = ZOOM_LVL_END);
 
 /**
  * Calculates the length of a tunnel or a bridge (without end tiles)

src/tunnelbridge_cmd.cpp

@@ -80,6 +80,20 @@ void MarkBridgeDirty(TileIndex tile, const ZoomLevel mark_dirty_if_zoomlevel_is_
 	MarkBridgeDirty(tile, GetOtherTunnelBridgeEnd(tile), GetTunnelBridgeDirection(tile), GetBridgeHeight(tile), mark_dirty_if_zoomlevel_is_below);
 }
 
+/**
+ * Mark bridge or tunnel tiles dirty.
+ * @param tile Bridge head or tunnel entrance.
+ */
+void MarkBridgeOrTunnelDirty(TileIndex tile, const ZoomLevel mark_dirty_if_zoomlevel_is_below)
+{
+	if (IsBridge(tile)) {
+		MarkBridgeDirty(tile, mark_dirty_if_zoomlevel_is_below);
+	} else {
+		MarkTileDirtyByTile(tile, mark_dirty_if_zoomlevel_is_below);
+		MarkTileDirtyByTile(GetOtherTunnelBridgeEnd(tile), mark_dirty_if_zoomlevel_is_below);
+	}
+}
+
 /** Reset the data been eventually changed by the grf loaded. */
 void ResetBridges()
 {