convertFromHTML doesn't preserve <br>s inside <div>s

Let’s say I have some text in the editor:

hello

we're separated by a line


and us by two

In the editor, when creating this text, I end up with 6 blocks, with the 2nd, 4th, and 5th having empty text.

The HTML I generate from this text looks like this (which is very similar to the HTML outputted during editing):

<div>hello</div>
<div><br></div>
<div>we're separated by a line</div>
<div><br></div>
<div><br></div>
<div>and us by two</div>

If I use convertFromHTML() on this HTML, I would expect to get 6 content blocks back. Instead, I only get 3, and all of the empty lines get collapsed. So after I load the 3 blocks, the text in the editor ends up like this:

hello
we're separated by a line
and us by two

[benbriggs]

This was discussed a bit in https://github.com/facebook/draft-js/issues/231:

This was on purpose to keep pastes of long text from having a lot of extra spaces between paragraphs. The content coming in can be pretty messy sometimes and this is one of the things we try to do to clean it up.

[Smaxor5]

This is awful default behavior.