Crash in Fl_Device when running under Xnest

[vljubovic]

Segfault when program ekeyconf is run under Xnest. Backtrace:

#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb78f6fc0 in raise () from /lib/i686/libc.so.6
#2  0xb78f8851 in abort () from /lib/i686/libc.so.6
#3  0xb7d55624 in Fl_Device::Fl_Device () from /usr/lib/libefltk.so.2.0
#4  0xb7aded05 in std::set_unexpected () from /usr/lib/libstdc++.so.6
#5  0xb7aded42 in std::terminate () from /usr/lib/libstdc++.so.6
#6  0xb7adf425 in __cxa_pure_virtual () from /usr/lib/libstdc++.so.6
#7  0xb7d8c594 in Fl_Widget::draw_frame () from /usr/lib/libefltk.so.2.0
#8  0xb7db7716 in Fl_Input_Browser::draw () from /usr/lib/libefltk.so.2.0
#9  0xb7d59228 in Fl_Group::draw_child () from /usr/lib/libefltk.so.2.0
#10 0xb7d59a7b in Fl_Group::draw () from /usr/lib/libefltk.so.2.0
#11 0xb7d593b9 in Fl_Group::update_child () from /usr/lib/libefltk.so.2.0
#12 0xb7dfb30a in Fl_Tabs::draw () from /usr/lib/libefltk.so.2.0
#13 0xb7d593b9 in Fl_Group::update_child () from /usr/lib/libefltk.so.2.0
#14 0xb7d59b5b in Fl_Group::draw () from /usr/lib/libefltk.so.2.0
#15 0xb7d8f8f3 in Fl_Window::draw () from /usr/lib/libefltk.so.2.0
#16 0xb7d8eb03 in Fl_Window::flush () from /usr/lib/libefltk.so.2.0
#17 0xb7d77f6e in Fl::flush () from /usr/lib/libefltk.so.2.0
#18 0xb7d7c1a1 in Fl::wait () from /usr/lib/libefltk.so.2.0
#19 0xb7d7c251 in Fl::run () from /usr/lib/libefltk.so.2.0
#20 0x0804c1de in main (argc=1, argv=0xbfee3c24) at ekeyconf.cpp:138