I am using 10.8.5 with Preview V 6.0.1(765.6).
When I use Tools->Annotate->Highlight Text to select texts in order to highlight them, I expect it to be a rectangle region. But it is not, see the picture below.
Personally, I don't like it being this way (if this is not a bug). I tried 3 different PDF files, and I got the same results.
Is there any option to change this?