Add Small Window feature

[Korb]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.
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Feature description

The Small Window (aka picture-in-picture mode) feature allows you to display a window overlaying other apps and pin it to the edge of the screen as an always-on small label. The label can be freely moved along the side edges of the screen.

Why do you want this feature?

This mode in the case of a image gallery is convenient because it allows you to place a sticker on the screen with data that you need constant access to while working with another application. At the same time, unlike Split-screen, this mode does not significantly reduce the size of the main application, but prevents it from being unloaded from memory without having to disable memory optimization for this application.

Additional information

Android Developers / Develop / Core areas / UI / Guides / Support multi-window mode