Use GetSysColorBrush(COLOR_WINDOW) when there is no brush for drawing background in listbox

[Dmitry Timoshkov]

Hello.

I was privately informed that my patch
"Prepare background while drawing radio buttons and checkboxes"
solved some painting problems with radio and check buttons
in ws_ftp.exe. Also I was asked to have a look at problems
with repainting listboxes in ws_ftp. Here is a fix for them.

Changelog:
    Dmitry Timoshkov <dmitry at codeweavers.com>
    Use GetSysColorBrush(COLOR_WINDOW) when there is no brush
    for drawing background in listbox.

diff -u cvs/wine/controls/listbox.c wine/controls/listbox.c
--- cvs/wine/controls/listbox.c	Tue Jan 16 21:39:30 2001
+++ wine/controls/listbox.c	Sat Feb 24 22:00:43 2001
@@ -2986,8 +2986,14 @@
             RECT rect;
             HBRUSH hbrush = SendMessageW( descr->owner, WM_CTLCOLORLISTBOX,
                                               wParam, (LPARAM)wnd->hwndSelf );
-            GetClientRect(hwnd, &rect);
-            if (hbrush) FillRect( (HDC)wParam, &rect, hbrush );
+	    TRACE("hbrush = %04x\n", hbrush);
+	    if(!hbrush)
+		hbrush = GetSysColorBrush(COLOR_WINDOW);
+	    if(hbrush)
+	    {
+		GetClientRect(hwnd, &rect);
+		FillRect((HDC)wParam, &rect, hbrush);
+	    }
         }
         return 1;
     case WM_DROPFILES: