blank line disappear when pasting text from viewer (or preview) (3MD)

[sohee-lee7]

Version

v1.4.0

Test Environment

Chrome

Current Behavior

AAA
BBB

CCC
DDD

=> It is rendered like below. (Each <p> has margin so look like there is an empty line between two paragraph.)

<p>AAA<br>BBB</p>
<p>CCC<br>DDD</p>

=> When it is pasted, there is no tags for empty line between <p>. So it will be pasted like this:
AAA
BBB
CCC
DDD

Expected Behavior

Should be pasted like this:

AAA
BBB

CCC
DDD

Solution

Insert <br> between <p>.

By default, browsers separate paragraphs with a single blank line.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/p#Styling_paragraphs

But Word or PowerPoint use <p> as one line.

But when <p> is used for meaning one line (ex: pptx and other editors that use <p> for one line), unexpected empty line is generated when pasting.