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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 64ec4000 ) Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
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