[Feature] Allow disabling math field focus when browser tab regains focus

[pwawrzynczyk]

Description

I'd like to be able to stop the math field from regaining focus and scrolling back to it when the browser tab is focused again. I realize the current behavior may still be desirable for some use cases, so a flag to configure it would be perfect.

Steps to Reproduce

0. Have a page with a math field at the top and some other content below, so that if we scroll to the bottom of the page, the math field won't be visible anymore.
1. Focus the math field.
2. Scroll to the bottom.
3. Switch tab.
4. Switch back to the original tab.

Actual Behavior

When the user switches back to the original tab, page refocuses the input and scrolls to it. This may confuse some people, who left the focus on the field, but then started looking at the rest of the page and don't want to get back to it.

Expected Behavior

When the user switches back to the original tab, there is no scroll or focus change - the math field stays blurred.

Environment

MathLive version: 0.92.1 and 0.98.6.

Checked on: Firefox, Chrome, Safari on desktop, Brave on mobile.