Fit Image to Window, without centering

[rlaphoenix]

To add onto #13 , it would be fantastic if you could tick the Fit image to window option, and not center the image, keep it anchored to the top-left of the window.

[quietvoid]

Ideally the image position should be possible to change in the preferences. It defaults to centered, and moves to the left when the image doesn't fit the window.