i say go with what Mark suggested[1] - to use seperate designs for the two cases:* perhaps a hollow red circle on the button for "hide window"
* the red button with the X for "close & quit"
The WM only needs to know, if the app is about to quit upon click, or not, in order to draw the correct frame.
[1] https://lists.launchpad.net/ayatana/msg02181.html
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just close.png
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Attachment:
close and quit.png
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