increase treshold for loading out-of-view images
increase treshold for loading out-of-view images

this avoids more not-yet loaded images when scrolling down

nsams/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,yacon/koala-framework,yacon/koala-framework,koala-framework/koala-framework,nsams/koala-framework,kaufmo/koala-framework,nsams/koala-framework,yacon/koala-framework,koala-framework/koala-framework