From 2972728b5eaa8a9245889b218bcaea3ca7a3487c Mon Sep 17 00:00:00 2001
From: Curtis Shmyr <cjshmyr@gmail.com>
Date: Thu, 16 Feb 2012 20:05:10 -0700
Subject: [PATCH] Ctrl-Shift-numkey performs unit grouping into existing groups

---
 OpenRA.Game/Selection.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/OpenRA.Game/Selection.cs b/OpenRA.Game/Selection.cs
index 9be2cd598d..34ffd57939 100644
--- a/OpenRA.Game/Selection.cs
+++ b/OpenRA.Game/Selection.cs
@@ -72,7 +72,8 @@ namespace OpenRA
 				if (actors.Count == 0)
 					return;
 
-				controlGroups[group].Clear();
+				if (!mods.HasModifier(Modifiers.Shift))
+					controlGroups[group].Clear();
 
 				for (var i = 0; i < 10; i++)	/* all control groups */
 					controlGroups[i].RemoveAll(a => actors.Contains(a));