Gregory's ServerNow actually implementing this animation will require quite a bit of refactoring in Identity. For starters, this would require writing a container that allocates child pages manually for all display modes, since GtkBox and AdwTabView, currently used by Identity, don't support this kind of trickery.
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 I'm not sure if there's a good generic way to solve this. But either way, the layout code will probably need further complications to support this smooth transitioning. |
Then, while making this mockup, I discovered a bit of a recurring issue with animations: even though the starting and the final states are laid out with parent-child relations (in this case, the child picture is scaled to fit inside the parent black rectangle), in the middle of the animation you *don't* want this. It makes the animation nonlinear and bad looking.
This is the same reason GNOME Shell overview animation sends windows on slightly curved paths btw.