Correctly defer undo operations when messages arrive out of order

Co-Authored-By: Nathan Sobo <nathan@zed.dev>
Co-Authored-By: Max Brunsfeld <max@zed.dev>
556d9cc53fAntonio Scandurra committed on 3/3/2022, 5:07:59 PMparent410ee12
5 files changedLine totals unavailable