[BUG] Flickering when zooming

[RndUsr123]

When zooming in/out in steps and zoom > Fit window to image is used, some flickering happens.
This is especially obvious at a reduced screen refresh rate and seems to be caused by a render timing issue: the image is moved first and scaled second. This behavior happens when smoothly zooming too, but it's harder to notice.
For the record, any zoom-capable device is affected (5 tested).