This unbreaks new-lv-buffer detection for old cams.
Created originally on Bitbucket by OtherOnePercent (One Percent)
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On 50D/7D/5DII? the anamorphic would collapse and new peaking draws over itself repeatedly.
I think this is because the get* style functions are out of sync with the display filter. In the case of defish + raw previews it worked. I also tested the update buffer function the the lv vsync signal and it does update at least on 50D/7D