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ref: Remove more state data from the steppers and streamline the parameter resetter #879

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@niermann999 niermann999 commented Nov 7, 2024

  • Shift the update of the step size in the stepper, so that we go from a "previous step size" to a "next step size".
  • Remove the volume material pointer from the state and instead get it from the navigator hand it through to the functions that need it
  • Remove the "path from surface" and reimplement it in the actors that use it
  • Remove the next_surface_aborter, which is superseded by the ckf_aborter in traccc (need to move the test to traccc)
  • Remove the previous surface index and instead use the surface link on the bound track parameters before they are updated
  • Remove the stepping direction and calculate it on the fly

Also streamlines the parameter resetter, as the jacobians are already default initialized correctly and a separate kernel is not needed, since the relevant functionality already exists on the tracking_surface

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Based on #877

@niermann999 niermann999 added refactor refactoring the current codes priority: medium medium priority blocked This item is blocked by another item labels Nov 7, 2024
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