Always send out _GNUSTEP_WM_ATTR to window manager

[Yen-Ju Chen]

Hi,

 This is a patch which will always send out _GNUSTEP_WM_ATTR attributes to 
window manager.

 There are three GNUstep-specific attributes:
 _GNUSTEP_WM_ATTR, _GNUSTEP_WM_MINIATURIZE_WINDOW,
 _GNUSTEP_TITLEBAR_STATE.

 _GNUSTEP_WM_ATTR is for window decoration and window level,
 and currently, it is send out only for WindowMaker.

 Since it is private attributes, not in ICCCM and EWMH,
 It is safe to always send it out.
 Most of the window manager will simple ignore/unaware of this attribute.
 (I test it in WindowMaker and hackedbox).

 Another reason that this attribute has to be send out
 is that EWMH, which define window level, doesn't fit GNUstep window level 
very well.
 In other word, window manager knowing EWMH will support GNUstep window 
level fine,
 but window manager knowing _GNUSTEP_WM_ATTR can support GNUstep window 
level perfectly.

 Yen-Ju

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