Changeset comment text is lost when switching entity pages

[dreua]

URL

https://www.openstreetmap.org/changeset/148222445?way_page=1

How to reproduce the issue?

1. You need a changeset with multiple pages of changed enitties
2. Write some text in the comment box
3. Click on one of the numbers in order to see more of the changed entities
4. Your comment is gone forever

Screenshot(s) or anything else?

This is very bad UX. I am very grateful to everyone who built openstreetmap.org as well as iD but I'll be even more grateful when this bug is fixed and I won't loose a comment ever again.

[HolgerJeromin]

Dev hint to solve this (not for the user of the page): 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

[dreua]

This was Firefox on Linux btw, haven't tried other browsers.

[dreua]

Ideally I'd say there isn't a reload at all, just load the data via JS and leave the text field alone? But a warning would be definitely better than nothing

[danieldegroot2]

Related #2088.

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