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It's written in the commit comment, but basically I noticed that if I ran two moves:
G1X10
G1X10
I could hear the steppers hesitate between the moves. This change removes that hesitation, at the price of a possibly much longer-running timer interrupt.
This is because next_move is now tail-recursive when there are zero step moves queued.
Also it's not yet perfect, see commit notes for my reflections on the timer status across moves.