[bug #21571] Giant blank app-windows under IceWM

[Fred Kiefer]

Follow-up Comment #1, bug #21571 (project gnustep):

>From the log file I would say that something goes horribly wrong in the way
the window border sizes get computed. The window ends up with a negative size
and at some point this negative number is taken as a huge positive one and
your giant window is requested from X11. This step of course fails.

What we have to do now, is find the place, where the negative number gets
treated as a positive one. This surely is a GNUstep bug.
And we have to find out, why a negative frame size gets reported by the
backend. Here the interaction with the window manager seems to fail. As I
don't think I have IceWM installed, would it be to much to ask you to debug
into this?
The interesting bit is the styleoffsets::::::: method in XGServerWindow.m.
Here a lot of completely different ways to get the window border sizes are
implemented. Depending on what the WM supports, one of them gets called. It
would be interesting to know, which one this is for IceWM and why it fails.
I promisse to look into the other part of the problem.

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