Inactive cogentcore application uses CPU

[Evgeniyuzbek]

Describe the bug

Inactive cogentcore application uses CPU. Same bug as in fyne.
It is critical bug for mobile devices if application will work in background or permanently.

How to reproduce

Create any cogentcore application with .RunMainWindow() and check cpu using. For example, you can use linux top. It indicated from 4% to 4.6% of cpu.

Example code

Relevant output

Platform

Linux

[Evgeniyuzbek]

I'm investigating this bug. Now more complex application does not use cpu when it is inactive.

[Evgeniyuzbek]

Corrected phrase in reprodusing section: "It indicated from 0% to 4.6% of cpu."
So, I confirm, bug exists.