[patch #6630] Patch to always check -isFlipped as Cocoa does rather than accessing the flag directly

[Nicola Pero]

Follow-up Comment #2, patch #6630 (project gnustep):

Well ... I don't remember much about this, so I can only state the obvious
...

how often would -isFlipped be called when a standard window is drawn ?  Is
it 10 times, 1k times, 10k times ?  That gives you an idea of how important
it would be to keep the optimization ...

If the optimization is useful, then maybe you could compute the flag once
at the beginning of each draw cycle ?

Anyway my guess is that it's quite likely that the optimization can go away 
without any noticeable impact on the performance, but it's worth checking

Thanks

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