[bug #24083] Offset issues with the xmonad WM; blank windows with the cairo backend

[Fred Kiefer]

Follow-up Comment #3, bug #24083 (project gnustep):

So there are two issues. One with the cairo backend and one with the xmonad
interaction.

For the cairo backend issue I will need to know which version of cairo and of
GNUstep are being used.

For the other problem I may need to explain first, why GNUstep tries to
determine the window border. In OpenStep it is possible to position the
contents of a window as well as the window itself, to do this reliable we need
to know about the border of the window. It even goes as far as positioning an
unmapped window, where we cannot determine the current border. That is why we
try to find out about standard windows borders when GNUstep starts up. 

For most modern window managers we have code to do this, perhaps we need to
add an extra bit for window managers that don't reparent a window. Here we
only get ConfigureNotify events (#22 in the log you send), perhaps we could
just rely on the border width given there.

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