Please describe the problem:
Open popup window from maximized main one imply restore of main window to his original size. 

Steps to reproduce:
1. First toplevel window must but miximized or fullscreen mode.
2. Application need to have menu tearoffs enable. Use tearoffs, window detach from the menu and main maximized window is restored. It's like you checked the restore button on decoration window.
3. We use also gtk_window_get_transient_for() and same problem happen when we call this fonction for a popup window.


Actual results:
Maximised windows is restored.

Expected results:
Maximised windows don't change.

Does this happen every time?
YES

Other information:
I don't have time to compile by myself library but I give my point of view without check. I suppose the problem can be solve by it. 

--- gdkevents-win32.c.orig      2008-02-26 14:28:41.000000000 +0100
+++ gdkevents-win32.c   2008-02-26 14:29:05.000000000 +0100
@@ -1305,7 +1305,7 @@
       if (GDK_WINDOW_IS_MAPPED (window))
         {
           if (!hide_window)
-            ShowWindow (GDK_WINDOW_HWND (window), SW_RESTORE);
+            ShowWindow (GDK_WINDOW_HWND (window), SW_SHOWNORMAL);
           else
             ShowWindow (GDK_WINDOW_HWND (window), SW_MINIMIZE);
         }

In fact, recursive calls make all windows to restore instead of just keep their size. Prehaps SW_SHOW, SW_SHOWNA, SW_SHOWNOACTIVATE can be better but you have to choose what you really need. (refer to http://msdn2.microsoft.com/en-us/library/ms633548(VS.85).aspx)