Obscure chat after some period of time.

I really like to use keybase for secure chat. That often means that in the chat window there is information that I would like to hide from wandering eyes. A screen saver is useful if I am not using the whole computer but in the case when I am working on my computer but not actively using the chat, it would be really nice if the chat client would go into a screen-saver-like mode after some period of time.

No files, tests, or entry points are named. Start by locating the chat client's handling of inactivity and window content, then determine how a screen-saver-like obscuring mode should be triggered and exited. Done requires an agreed timeout behavior that hides chat information while the user remains active elsewhere on the computer.

Written by the indexing model from the issue text.