Hi,

When viewing JPG photos from my Canon DSLR the pictures in portrait orientation are shown in landscape orientation but only in the top half and not top to bottom as if the display rotation code failed.

Rotating the photo once fixes the picture display to correct portrait mode and rotating once again shows the picture using the full window to display it in landscape mode.

Reproducible: Always

Steps to Reproduce:
1. Open a portrait imagem from Dolphin (in dolphin it previews correctly).
2. Let gwenview open the JPG
3. Rotating the image once;
4. Rotating the image once again;

Actual Results:  
1. Gewnview opens the selected photo.
2.The image appears rotated in landscape mode but resized to match portrait aspect ratio.
3. Produces the correct image view in portrait mode.
4. Displays it in correct landscape mode (using the full window).

Expected Results:  
1. N/A
2. The image should be shown in correct EXIF orientation from the top to the bottom of the window.
3. Should rotate to landscape orientation;
4. Should rotate back to portrait orientation;

This only happens in photos directly from my Canon DSLR.

If I rotate the image, save it and close gwenview. it then appears upside down in dolphin preview and when opened again in gwenview.

If I rotate the image again and save it, it now appears correctly in portrait mode.