Remember to cover the basics, that is, what you expected to happen and
what in fact did happen. You don't know how to make a good report?
See
http://orgmode.org/manual/Feedback.html#Feedback
Your bug report will be posted to the Org-mode mailing list.
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If you narrow the buffer to a subtree, insert some content and widen
again the content below the subtree moves into the subtree if there
was no newline on the last line of the narrowed subtree.
example.org
,----
| * Headline 1
|
| * Headline 2
`----
Narrow the buffer to "Headline 1", entere some text and remove all
empty lines below the entered text.
example.org (narrowd)
,----
| * Headline 1
| Hello World!
`----
example.org (widened again)
,----
| * Headline 1
| Hello World!* Headline 2
`----
I do know that this behaviour makes absolutely sense as removing the
newlines in the narrowed subtree equals to removing the newlines in
the whole buffer.
But as you can imagine this behaviour can be disastrous in Orgmode: I
stumpled upon this just because I remembered to have a todo item on my
list but Orgmode didn't know about it -- it was sucked into
another item.
Maybe Orgmode should use a function `org-widen' that ensures a newline
at the end of a narrowed buffer before calling the Emacs' `widen'.