Provide warning about in page editing of profiles

When you are configuration an event, if you choose an existing event location that is in use by another event you get the warning message:
"Note: This location is used by multiple events. Modifying location information will change values for all events."

However when configuring online registrations two screens later there is no similar warning message if you select a profile that is used by other events.

There should be some sort of warning, because someone is sure to change a profile inappropriately if there isn't one.

It could be a static warning as on the event location screen, or, better still, one that pops up when edit is selected and says something like:

'This profile in use in other events. Editing it will change the information collected for all those events also. If that is not your intention please copy the price set, then rename and edit the fields in the copy you have made."

This should also happen on contribution pages.