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pdftoppm should handle rotation (landscape) before applying -scale-to options.

Greg Alexander requested to merge galexand/poppler:orientation_before_scaling into master

I've been using pdftoppm -scale-to-x 1200, but for landscape documents the resulting image gets a Y dimension of 1200, instead of the X dimension. To fix this, I've simply moved a little code to apply the orientation (swap width and height) a couple lines earlier, before computing the resolution from scaling.

Benefits: -scale-to-x will now uniformly set the width of the resulting image. Caveats: anyone who depends on (or works around) the old behavior will now be upset.

Thanks!

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