From 2817cd41f1b42a7d3901a92c6cda85a90765600a Mon Sep 17 00:00:00 2001
From: stormcone <48624099+stormcone@users.noreply.github.com>
Date: Sun, 7 Jul 2019 19:44:08 +0200
Subject: Fix #7250: Viewport kdtree not being updated for waypoints when sign
 moved.

Code based on the patch by JGRennison.
JGRennison/OpenTTD-patches@ac84f34062ef1f3ffcdee49dc595d574e4efb4d5
---
 src/waypoint_base.h  |  2 ++
 src/waypoint_cmd.cpp | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/waypoint_base.h b/src/waypoint_base.h
index c11c2f2b2..be1d0bd0d 100644
--- a/src/waypoint_base.h
+++ b/src/waypoint_base.h
@@ -27,6 +27,8 @@ struct Waypoint FINAL : SpecializedStation<Waypoint, true> {
 
 	void UpdateVirtCoord() override;
 
+	void MoveSign(TileIndex new_xy) override;
+
 	inline bool TileBelongsToRailStation(TileIndex tile) const override
 	{
 		return IsRailWaypointTile(tile) && GetStationIndex(tile) == this->index;
diff --git a/src/waypoint_cmd.cpp b/src/waypoint_cmd.cpp
index 20e600b5e..652173a94 100644
--- a/src/waypoint_cmd.cpp
+++ b/src/waypoint_cmd.cpp
@@ -47,6 +47,21 @@ void Waypoint::UpdateVirtCoord()
 	InvalidateWindowData(WC_WAYPOINT_VIEW, this->index);
 }
 
+/**
+ * Move the waypoint main coordinate somewhere else.
+ * @param new_xy new tile location of the sign
+ */
+void Waypoint::MoveSign(TileIndex new_xy)
+{
+	if (this->xy == new_xy) return;
+
+	_viewport_sign_kdtree.Remove(ViewportSignKdtreeItem::MakeWaypoint(this->index));
+
+	this->BaseStation::MoveSign(new_xy);
+
+	_viewport_sign_kdtree.Insert(ViewportSignKdtreeItem::MakeWaypoint(this->index));
+}
+
 /**
  * Find a deleted waypoint close to a tile.
  * @param tile to search from
-- 
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