[openstreetmap/openstreetmap-website] Changeset comment text is lost when switching entity pages (Issue #4561)

[Holger Jeromin]

Solution: Add conditionally a `beforeunload` handler. But beware of this:

> Important: the beforeunload event should only be used to alert the user of unsaved changes. Once those changes are saved, the event should be removed. It should never be added unconditionally to the page, as doing so can hurt performance in some cases. 

https://developer.chrome.com/docs/web-platform/page-lifecycle-api#the_beforeunload_event


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