Deleting a line break in the middle of text automatically adds one at the end

Create a piano score, add staff text and confirm changes. We have:

Staff Text

Edit the text to add a line break. Confirm changes. We have:

Staff [LINE BREAK]
Text

Edit again the text to remove the line break. Confirm changes. The bug occurs. A line break was automatically added at the end of the text, so we have:

Staff Text[LINE BREAK]
[EMPTY LINE]

instead of:

Staff Text

Config: MuseScore 7ab8acd on Xubuntu 14.10.