Created attachment 109760 [details] scalled screenshot Most apps use screenshots as preview which is fine but didn't works well when you shrink tham (see attachment).
Created attachment 109762 [details] app screenshot preview window wide better is to define the preview area e.g. window wide and aspekt ratio 16:9 and fit there the screenshot (in a slideshow) everything that didn't fit in the height will be cutted (and visible when click on it). If the screenshot is small than the maximum wide will be defined as 100% of the image wide and if the screenshot is big than minimum scale will be 50% otherwise you get again scaling troubles (everything which is bigger will be cutted)
*** Bug 388782 has been marked as a duplicate of this bug. ***
This has been reworked already.