Wing IDE Broke?

Seeing this in a text editor makes me nervous:

That’s invalid code, but I didn’t write it: the IDE is displaying my file completely incorrectly. There are lines missing. There is some kind of repaint bug and it has something to do with scrolling. No matter how featureful an IDE might be, I can’t use it if it can’t show me a text file without jumbling the lines. When I once saw an open source text editor do the same kind of thing, I dropped that editor so fast that I no longer remember its name. 🙂