- make it unlikely that a new view instance would accept a view zone id from a previous view instance
- remove that the find widget removes a view zone id from another view
(fixes #71745)

Const is preferred for type guards

We compile using the alwaysStrict flag so these directives are not needed

This part removes most `use strict` directives that are right after the file header

This reverts commit 9b06d439.

This reverts commit e55b563d, reversing
changes made to 66650300.