Implement Split window column sorting by double-clicking on any column header.
(Standard Windows column sorting feature, eg, File Explorer)
The customary practice, in Q, is for a single click on a column header to sort that column and a 2nd click on the header to sort the column in the reverse order.
SO, as written, I'd oppose this IDEA, but if re-proposed as allowing sorts within transaction splits I'd support it.
Alpha-sorting the Split Transaction dialog by Category Name? Really? Why?
I'd rather support a method to easily drag or otherwise move a Split Line item up or down within the dialog.