[TxMt] Gutter mark with single line value looks odd

[Jacob Carlborg]

I started trying out the new gutter mark functionality. I noticed when I 
add a gutter mark with a value with a single line, the popover looks 
kind of odd. It looks like a graphical bug [1]

[1] https://drive.google.com/file/d/0B7UtafxGD9vELTRJbkNJVm9md0k/view

-- 
/Jacob Carlborg