[bug #16031] -back: Segfault in XGServerEvent.m

[Andrew Sveikauskas]

Follow-up Comment #2, bug #16031 (project gnustep):

No, it is also accessing it.  Note that cWin is a macro for
generic.cachedWindow.  It then accesses cWin->number.  After preprocessing
this is generic.cachedWindow->number.  Invalid pointer dereference...  As for
chasing the bug further, not sure.  I'm not familiar with the way -back is
organized nor very familiar with Xlib.  But the problem seems to be that the
structure is freed before any calls to NSMapRemove() (it seems to me like
XGServerWindow-termwindow: does this.)

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