fix: cont_grid scan fixes

csaxs_bec/scans/scans_v4/cont_grid.py

@@ -195,13 +195,16 @@ class ContGrid(ScanBase):
         self._cont_motor_params["num_lines"] = int(
             np.ceil(np.abs(self.stepper_stop - self.stepper_start) / self.stepper_step_size)
         )
-        self.positions = position_generators.nd_grid_positions(
+        positions = position_generators.nd_grid_positions(
             [
                 (self.stepper_start, self.stepper_stop, self._cont_motor_params["num_lines"]),
                 (self.fast_start, self.fast_end, frames_per_trigger),
             ],
             snaked=False,
         )
+        # Count only the end point of each line as a valid position, as the fast axis is continuously moving and only triggered at
+        # the beginning of the line moving to the end point.
+        self.positions = positions[(frames_per_trigger - 1) :: frames_per_trigger, :]
         # Get device specific parameters
         self._fetch_device_params()
 
@@ -223,6 +226,7 @@ class ContGrid(ScanBase):
             positions=self.positions,
             num_points=len(self.positions),
             frames_per_trigger=frames_per_trigger,
+            computed_positions=positions,
         )
 
         self.actions.add_scan_report_instruction_device_progress(self.mcs)