Overlapping text in Dimension

I tried dimension, with Text Alignment as "Horizontal", it makes overlapping of line on the right of text.

See screenshot:



It is more clear from dimension at bottom with label "O" [ uppercase "o"  ]

Mine version is:

Version: 2.2.0-alpha
Compiler: GNU GCC 5.3.1
Compiled on: Jun 10 2016
Qt Version: 5.5.1
Boost Version: 1.58.0
System: Ubuntu 16.04 LTS

Is it bug, or used something in a wrong way?