(svn r14143) -Codechange: Recenter viewport of waypoint window when relocating the waypoint.

src/waypoint.cpp

@@ -249,6 +249,7 @@ CommandCost CmdBuildTrainWaypoint(TileIndex tile, uint32 flags, uint32 p1, uint3
 
 			RedrawWaypointSign(wp);
 			wp->xy = tile;
+			InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
 		}
 
 		const StationSpec* statspec;

src/waypoint_gui.cpp

@@ -77,6 +77,13 @@ public:
 		}
 	}
 
+	virtual void OnInvalidateData(int data)
+	{
+		int x = TileX(this->wp->xy) * TILE_SIZE;
+		int y = TileY(this->wp->xy) * TILE_SIZE;
+		ScrollWindowTo(x,y, this);
+	}
+
 	virtual void OnQueryTextFinished(char *str)
 	{
 		if (!StrEmpty(str)) {