copying and pasting a single line of text onto a new line does not retain the style

[Lynn Robinson]

Steps to reproduce

1. Apply a style to a single line of text in the full editor using the style combo dropdown
2. Select all of the text again, and copy (ctrl-c).
3. Position cursor at the end of the text and press return to create a new line. Now Paste (ctrl-p). The style formatting is not retained in the pasted text.

(However, if you copy/paste multiple lines, the bug does not happen, the style is successfully retained.)

Expected result

The pasted line should retain the style

Actual result

The pasted line does not retain the style

Other details (browser, OS, CKEditor version, installed plugins)

Happens in your demo, even in your 10/7/15 nightly build: ​http://nightly.ckeditor.com/15-12-10-07-07/full/samples/

Bug happens in multiple browsers: Firefox, IE, and Google Chrome