I'll pick gnome-calculator as an example since it shows stretched in
both Xenial and Yakkety.
The issue seems to be the appstream generator is making stretched
thumbnails and gnome-software / appstream-glib is choosing these over
the original images. For gnome-calculator (which shows the problem in
both Xenial and Yakkety) the dep11 data  gives:
- height: 702
- height: 423
- height: 351
- height: 63
The large thumbnails are distorted and should not be used/generated.
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Some app screenshots wrongly stretched in Ubuntu version of Gnome
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