'Tis the season for ice-encased vehicles. The M3 Prototype's windows seem to be frameless. Did anyone who got a test ride in a 3 prototype happen to notice if the windows do "the dip" to clear the upper trim? Hopefully Tesla manages to arrange things so that the doors can open and close without having to move the windows. One little area where function should probably outweigh style, IMO. I had a Subaru for several years with frameless doors. The windows didn't have to move to get in and out of it.