No real changes, just change type of MSWGetBgBrush() argument.

Pass wxWindow instead of HWND to it as in most cases we already have wxWindow
for the HWND we have and calling wxFindWinFromHandle() once more is
unnecessary.

This also makes the code of MSWGetBgBrushForChild() slightly simpler.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62932 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/notebook.cpp

@@ -1248,14 +1248,14 @@ void wxNotebook::UpdateBgBrush()
     }
 }
 
-WXHBRUSH wxNotebook::MSWGetBgBrushForChild(WXHDC hDC, WXHWND hWnd)
+WXHBRUSH wxNotebook::MSWGetBgBrushForChild(WXHDC hDC, wxWindow *child)
 {
     if ( m_hbrBackground )
     {
         // before drawing with the background brush, we need to position it
         // correctly
         RECT rc;
-        ::GetWindowRect((HWND)hWnd, &rc);
+        ::GetWindowRect(GetHwndOf(child), &rc);
 
         ::MapWindowPoints(NULL, GetHwnd(), (POINT *)&rc, 1);
 
@@ -1267,7 +1267,7 @@ WXHBRUSH wxNotebook::MSWGetBgBrushForChild(WXHDC hDC, WXHWND hWnd)
         return m_hbrBackground;
     }
 
-    return wxNotebookBase::MSWGetBgBrushForChild(hDC, hWnd);
+    return wxNotebookBase::MSWGetBgBrushForChild(hDC, child);
 }
 
 bool wxNotebook::MSWPrintChild(WXHDC hDC, wxWindow *child)