Added some reserved fields to BControlLook.

* This makes future changes less troublesome, although we should also add
  some virtual slots there (probably just dozens of it, though, that's why
  I was being lazy).
* Don't pass messages by value; they are copied twice this way.
* Minor coding style corrections, automatic whitespace cleanup.

headers/os/interface/ControlLook.h

@@ -272,7 +272,8 @@ public:
 									const rgb_color& base, uint32 flags,
 									const BPoint& where);
 
-			void				SetBackgroundInfo(BMessage msg);
+			void				SetBackgroundInfo(
+									const BMessage& backgroundInfo);
 
 protected:
 			void				_DrawButtonFrame(BView* view, BRect& rect,
@@ -370,6 +371,7 @@ private:
 			int32				fCachedWorkspace;
 			BMessage			fBackgroundInfo;
 
+			uint32				_reserved[20];
 };
 
 extern BControlLook* be_control_look;

src/kits/interface/ControlLook.cpp

@@ -2,6 +2,8 @@
  * Copyright 2009, Stephan Aßmus <[email protected]>
  * Distributed under the terms of the MIT License.
  */
+
+
 #include <ControlLook.h>
 
 #include "ContainerWindow.h"
@@ -1949,9 +1951,9 @@ BControlLook::DrawLabel(BView* view, const char* label, const rgb_color& base,
 
 
 void
-BControlLook::SetBackgroundInfo(BMessage msg)
+BControlLook::SetBackgroundInfo(const BMessage& backgroundInfo)
 {
-	fBackgroundInfo = msg;
+	fBackgroundInfo = backgroundInfo;
 	fCachedWorkspace = -1;
 }