Is it normal that text is not rendered as fixed-width in strings?

Is it expected that text does not always render as fixed-width in strings? Outside of strings everything is fine.

Here's a test case:

"XXXXXXXXXXXXXXXXX-"
"XXXXXXXXXXXXXXXXX–"

Note the difference between "-" (top line) and "–" (bottom line).

It is also triggered by other characters such as β.

I have IDEA 2016.1.3 on OS X.  I did not change the default font (Menlo).