below is an untested patch that sets the evaporate property
for newly-made overlays. munge to taste, etc.
This sets the property to t.
That is not what we are looking for now.
The goal now is to *find* possible bugs.
The patch should set the property to something unusual (maybe
`never-set') by default. When such an overlay becomes empty, there
should be some sort of warning. That way, people will find code
that perhaps ought to set the evaporate property to something
explicitly.
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