Just as one illustration, in a working image with a dozen or so windows open I have 180 instances of 'a TextStyle Bitmap DejaVu Sans 9' out of a total of 237 TextStyle objects. That probably isn't indicative of a well thought out usage pattern of an object one might (perhaps naively) think to be pretty much read-only.
Oh, and it looks like we messed up something in text rendering; select some text, cmd-k to change the font and set the choice to be quite a bit larger than the main font. If the original is a single line then the bounding box (?) doesn't get changed and thing look really weird. Multi-line texts may or may not get mangled in a similar way according to a pattern I can't discern yet. Like this -
Note that the cut-off at the bottom of the text is not from me cropping the image but the renderer screwing up