Gwenview ignores EXIF rotation on jpg files without file extension, it rotates the image correctly just by renaming the file with the extension (can be ".jpg" or even the unappropriate ".png")

Reproducible: Always

Steps to Reproduce:
1. Open in Gwenview a jpg image which has EXIF rotation data but hasn't ".jpg" file extension
2. Image will appear unrotated (EXIF rotation value ignored)
3. Just rename the file by adding ".jpg" or even ".png" (even if the file is a jpg) and open it Gwenview
4. Image will apper rotate (according to EXIF rotation)

For reference, GIMP gets rotation right even on files without file extension.

Actual Results:  
Image not rotated.

Expected Results:  
Image rotated according to EXIF.