cannot adapt to the picture's size while viewing

[ghost]

hey, I'm an old user with Quicklook, I remembered it used to be able to adjust the viewing zoom size based on the picture's size. For example, when I view a small picture(446 x 220px for example), it can still show the whole view(adjust the zoom rate automatically), not just a very small part of it. But now when I open some pictures, the smallest zoom rate cannot let me see the whole picture(and it always be 90%), just an unclear part. I have to adjust by myself, that's not convenient. Hope to fix this problem. Thx.

the view automatically

the view I want to show(is without zoom bar)

[ghost]

some picture even show like this.(this is the smallest I can zoom in, cannot show more part of the pic)

[rabelux]

related to #640 and #610 and should be fixed in the meantime