Thanks for reading this. When a picture is zoomed to a specific percentage, pixels in the pictures may not be accurately posited (a deviation of 1-2 pixels) so that a straight line may be shown as curved. This happens both in the newest and older versions of Gwenview. I'll update a picture soon to describe the bug further more. Reproducible: Always Steps to Reproduce: 1. Zoom a picture to a specific percentage. 2. Drag the picture. 3. The position of pixels may shift.
Created attachment 91054 [details] The picture to explain the bug.
*** This bug has been marked as a duplicate of bug 271671 ***