I've build the svn head revision at 15-06-09 14:20.
I'm not seeing any difference, I have also confirmed it is not only a visual effect, the text is actually not selected (tested with ctrl-c, ctrl-v)
This is what happens when I click and drag over text:
What I am seeing is, that this 'selecting' does not work using shift-click. Placing the cursor before the text and clicking after the text while holding shift, should give the same result as click-and-drag over that text.
As said, I can only reproduce this with the 'nvidia hardware drivers' enabled.