[bug #17717] Use "open panel" twice make it unusable

[Yen-Ju Chen]

Follow-up Comment #33, bug #17717 (project gnustep):

I check the implementation of some window managers about close and map
window.
When GNUstep ask to orderOut an window, it sends out a unmap notify via
XWithdrawWindow().
Every window manager will remove the decoration and reposition the window.
That's where each window manager differs. 
And it probably explain why the size change.

For example, if you open an inspector in WindowMakaer (right-click on title
bar, then choose "Attribute..."),
and try to disable various window decoration.
You will notice that if you remove the border, 
WindowMaker will try to move the window so that the top-left corner  stay the
same.
But if you try to remove the titlebar, it won't reposition the window.
So the title bar disappear and the rest of window stay where they are.

But in Azalea, if you remove the decoration by righ-click on the icon on the
title bar,
it will reposition the window so that the left corner stay the same.

Therefore, you probably cannot expect the window size will stay the same
during the order out and order front. But most of time, they will.


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