#10 [X11?] EnterNotify/LeaveNotify hack.

[Richard Rauch]

A severe bug noted in OpenGLUT was somewhat hacked
around. The hack should probably be revised to a real
fix, as Nigel and I apparently agreed in 200405.

The original bug would cause OpenGLUT programs to
crash disastrously.

I no longer remember the details of the hack that
"fixed" this, much less exactly how the code was broken
before the hack, nor the reason for the change that
broke the code so that the hack was required.

This bug inherited from OpenGLUT should be investigated,
and either addressed or closed.

See OpenGLUT bug: 939835

[Richard Rauch]

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Oh, and if this only affects menus, then it can be
ignored by and large, since menus are on the way out.

But it may also affect client menu windows.