Clicking the crop button a second time after moving the markers to show where you want to crop, resets the crop markers.

Clicking on the crop button at the bottom after moving the crop markers does not trigger this sort of behaviour.

Reproducible: Always

Steps to Reproduce:
1. Click on crop
2. Move markers(lines) to show where you want the Gwenview to crop the image
3. Click on the same crop button again (instead of the one on the bottom of the image.)
4. Crop markers are reset.
Actual Results:  
The markers reset

Expected Results:  
The images should be cropped where the markers are set.