Cropped image doesn't match selected crop are when CropSize doesn't have same aspect ratio as SourceImage

[Heroico]

Hi There! Before anything else, I want to thank the contributors for all the hard work into this component.

I am experiencing the following issue, in iOS 7.0:

1. I take a picture with the ipad rear camera
2. GKImageCropViewController gets pushed, with a crop size of (612, 792) (letter size paper)
3. I select a portion to crop, hit "use" button
4. The cropped image has the right aspect ratio ( 792/612 ) but wasn't cropped from the same area selected in 3)

I took pictures of grids to be really sure that (4) gets the wrong area. The origin of the cropped image nearly matches the selected area, but the size is wrong.

If between (1) and (2), I process the source image to have the aspect ratio of the target CropSize, the issue doesn't happen and I get a cropped image with the right cropped area.

I am pretty sure the problem is at

//GKImageCropView
-(CGRect)_calcVisibleRectForCropArea;

When debugging this method, I see:

1. the GKImageCropView.scrollView has size (612,792). the imageView has size around (592,792). The sourceImage has size (1936,2592).
2. the scaleWidth is calculated from the image.size and the cropSize:

CGFloat scaleWidth = self.imageToCrop.size.width / self.cropSize.width;
// then "scale" variable gets set to this value

3. The crop rectangle gets calculated from a transformation from scrollView to imageView

    CGRect visibleRect = [scrollView convertRect:scrollView.bounds toView:imageView];
// then visibleRect gets scaled according to "scale"

So, in short, the scale gets defined with an aspect ratio from image.size/cropSize, but the crop area gets defined from scaling the result scroll view -> imageView.

Should the scaleWidth and scaleHeight be calculated from imageView.size/cropSize?