Created attachment 8499497 [details] [diff] [review] v1 10.10 apparently broke kHIThemeFrameTextFieldSquare drawing, which we're currently using for single-line text fields: The focus ring is too small, and the border colors are all wrong (white + light gray instead of dark gray + light gray). NSTextFieldCell works.
Markus, how far back did you test this? Just to be sure, we should probably test it on every major version of OS X that we support (back to 10.6.8). I could do the testing myself, but frankly I'm not sure I'd be able to see all the differences it makes.
I've only tested it on 10.9 and 10.10. I'll create a try build soon which I'll use to test on the other platforms.
Comment on attachment 8499497 [details] [diff] [review] v1 And actually, on 10.9 the border color of non-disabled text fields is too light with this patch. And the border of a disabled text field is darker than of a non-disabled one...