From 3fbd2b6bbc4768cb6d381641f1dc197bb67a2013 Mon Sep 17 00:00:00 2001
From: stormcone <48624099+stormcone@users.noreply.github.com>
Date: Fri, 10 May 2019 19:19:07 +0200
Subject: [PATCH] Fix #7224: Drag and drop vehicle group creation does not work
 correctly.

When drag and drop a vehicle into an empty slot in the vehicle group window it tries to create the new group as the subgroup of the first group (GroupID = 0). This is failing if the dragged vehicle's type is different than the first group's vehicle type.

(cherry picked from commit 24c59283ecc334615bf68bf4d8a2fb258339a278)
---
 src/group_cmd.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
index 8226b795c1..1042859220 100644
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -596,7 +596,7 @@ CommandCost CmdAddVehicleGroup(TileIndex tile, DoCommandFlag flags, uint32 p1, u
 
 	if (new_g == NEW_GROUP) {
 		/* Create new group. */
-		CommandCost ret = CmdCreateGroup(0, flags, v->type, 0, nullptr);
+		CommandCost ret = CmdCreateGroup(0, flags, v->type, INVALID_GROUP, nullptr);
 		if (ret.Failed()) return ret;
 
 		new_g = _new_group_id;