Beaming in r.1321
There seems to be some problem with the beaming in r.1321.
Have a section with beamed quavers and semiquavers.
Change time signature to 5/4 - beams are grouped in 3+2
Beaming changes aren't undone.
I also note that if you click on the (new?) .. button, and then undo, again the beaming isn't undone.