Underscore not shown in Diff, on Windows

In the diff window on a commit, the underscore character is not displaying in at least one case.  As you can see in the image, the bottom `_api` reference displays the underscore character.  But neither the removal of ` _api.update();` nor the addition of `_api.onStateChange();` display the underscore.

Oddly, if I copy and paste the block, from the diff window, it comes out like this:

//Remove all api listeners on destroy
scope.$on('$destroy', function ()

Unknown macro: { _api.update(); _api.onStateChange(); _api.onViewNotifications(); }

);

//Call get function to get list on load.

While it doesn't keep the pluses and minuses, in the copy, it does keep the underscore,

Screenshot