#6: Add SWP_NOZORDER in the case it's not needed

[Dmitry Timoshkov]

Hello,

We can add SWP_NOZORDER for HWND_TOP and HWND_BOTTOM cases if the window
is already either first or last sibling. This allows to avoid at least
needless WM_WINDOWPOSCHANGED for ShowWindow(SW_SHOW) calls.

Please apply after #5.

Changelog:
    Dmitry Timoshkov <dmitry at codeweavers.com>
    Add SWP_NOZORDER in the case it's not needed.

--- cvs/hq/wine/dlls/x11drv/winpos.c	2004-04-01 22:54:18.000000000 +0900
+++ wine/dlls/x11drv/winpos.c	2004-04-01 22:56:40.000000000 +0900
@@ -763,7 +763,6 @@ static BOOL fixup_flags( WINDOWPOS *winp
         {
             winpos->flags &= ~SWP_NOZORDER;
             winpos->hwndInsertAfter = HWND_TOP;
-            goto done;
         }
     }
 
@@ -779,7 +778,17 @@ static BOOL fixup_flags( WINDOWPOS *winp
         (winpos->hwndInsertAfter == HWND_NOTOPMOST)) winpos->hwndInsertAfter = HWND_TOP;
 
     /* hwndInsertAfter must be a sibling of the window */
-    if ((winpos->hwndInsertAfter != HWND_TOP) && (winpos->hwndInsertAfter != HWND_BOTTOM))
+    if (winpos->hwndInsertAfter == HWND_TOP)
+    {
+        if (GetWindow(winpos->hwnd, GW_HWNDFIRST) == winpos->hwnd)
+            winpos->flags |= SWP_NOZORDER;
+    }
+    else if (winpos->hwndInsertAfter == HWND_BOTTOM)
+    {
+        if (GetWindow(winpos->hwnd, GW_HWNDLAST) == winpos->hwnd)
+            winpos->flags |= SWP_NOZORDER;
+    }
+    else
     {
         if (GetAncestor( winpos->hwndInsertAfter, GA_PARENT ) != wndPtr->parent) ret = FALSE;
         else