Copy/Paste problem for styled text

Formatting is not preserved when pasting.
When copy/pasting text which is has underline and bold style and is surrounded by text with underline style, the result only preserves the bold style.

To reproduce:

type: this is a test
select "this is a", make it bold and underlined
select and copy "is"
paste it somewhere else in the editor (for example on a new line)

The pasted text will only be bold, not underlined also.