add a close button with hotkey to diplomacy widget

OpenRA.Mods.RA/Widgets/Logic/DiplomacyLogic.cs

@@ -41,6 +41,8 @@ namespace OpenRA.Mods.RA.Widgets.Logic
 
 			validPlayers = world.Players.Where(a => a != world.LocalPlayer && !a.NonCombatant).Count();
 			diplomacy.IsVisible = () => (validPlayers > 0);
+
+			diplomacyBG.Get<ButtonWidget>("CLOSE_DIPLOMACY").OnClick = () => { diplomacyBG.Visible = false; };
 		}
 
 		// This is shit

mods/ra/chrome/ingame.yaml

@@ -198,6 +198,14 @@ Container@INGAME_ROOT:
 					Text:Diplomacy
 					Align:Center
 					Font:Bold
+				Button@CLOSE_DIPLOMACY:
+					X:(PARENT_RIGHT - WIDTH)/2
+					Y:350
+					Width:160
+					Height:25
+					Text:Close
+					Font:Bold
+					Key:escape
 		ChatDisplay@CHAT_DISPLAY:
 			X:250
 			Y:WINDOW_BOTTOM - HEIGHT - 30