app: fix #6961 Scaled image bug
With large image sizes a 32-bit int is not enough for the intermediate computations, which byte per pixel, width and height are. So, just like the function below it does: gimp_gegl_pyramid_get_memsize, we will cast these to gint64. Thanks to Massimo Valentini for finding the cause.
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failed
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flatpak | Gimp | ||
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