Side stage not restored after rotation

[Michal Predotka]

bq M10 silo #2177

Steps to reproduce:
1. In landscape add an app to the side stage
2. Make sure the side stage is not focused
3. Rotate to portrait and back to landscape

Expected result:
Both the side stage and main app are visible, like before rotation

What happens instead:
Only the main app is visible, the side stage is hidden

I understand this behaviour could be intentional but imo it'd be better if the side stage was restored even if the app there was not focused. My reasons: rotation could be made by accident (for example when carrying the device), even if I intentionally made the rotation, I don't expect to lose my windows arrangement.

[Michał Sawicz (saviq)]

I agree, side stage should only be dismissed by explicit user action (i.e. swiping it away).