Added DecoratorFrame() method, which returns the outer frame of the window

on screen (ie including the decorator border and tab). Plus the necessary
refactoring as well as some TODO notes about windows with the tab on the left
side.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29820 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/interface/Window.h

@@ -186,6 +186,7 @@ public:
 
 			BRect			Bounds() const;
 			BRect			Frame() const;
+			BRect			DecoratorFrame() const;
 			const char*		Title() const;
 			void			SetTitle(const char* title);
 			bool			IsFront() const;
@@ -331,6 +332,9 @@ private:
 			bool			_HandleKeyDown(BMessage* event);
 			void			_KeyboardNavigation();
 
+			void			_GetDecoratorSize(float* _borderWidth,
+								float* _tabHeight) const;
+
 private:
 			char*			fTitle;
 			int32			_unused0;