toolhead: Make sure input_shaper movement starts after endstop checking

Add a dwell() to the start of drip_move() to ensure that input_shaper
movements scheduled in advance of the nominal move time aren't
scheduled prior to the homing start.  (Otherwise the stepper may move
prior to endstop checking, which can corrupt the "no movement"
checks.)

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/toolhead.py

@@ -460,6 +460,7 @@ class ToolHead:
             npt = min(self.print_time + DRIP_SEGMENT_TIME, next_print_time)
             self._update_move_time(npt)
     def drip_move(self, newpos, speed, drip_completion):
+        self.dwell(self.kin_flush_delay)
         # Transition from "Flushed"/"Priming"/main state to "Drip" state
         self.move_queue.flush()
         self.special_queuing_state = "Drip"