Set frame origins when resizing splitview subviews. Don't let splitView do that, because PDFView will only get resizing notification when the size changes, and it seems to cache the window in its visible rect, which was calculated wrongly. 
Set frame origins when resizing splitview subviews. Don't let splitView do that, because PDFView will only get resizing notification when the size changes, and it seems to cache the window in its visible rect, which was calculated wrongly. 

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