Matrix Editor Changes, Please Test

   We've made a last minute Matrix editor change to fix a refresh bug. 
I know it's really late in the cycle, but if you have a moment, please 
build the latest from git and give the matrix a good beating prior to 
Wednesday.  Focus would be on deleting notes via undo, via selection and 
delete, cut, etc...  Any and all matrix editing might shake out other 
issues.

   Let me know what you find.

Thanks.
Ted.