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NSWindows disableScreenUpdatesUntilFlush is available since macOS 10.4, so there is no need to check if NSWindow responds to it. Additionally clarify the comment about why it is there by replacing it with a comment taken from Apple sample code that explains it very well. (cherry picked from commit 64ec400081755265ebb8e233192b9a01d61f54a7) Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
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