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Keep focus temperature until next autofocus is complete

Florian Signoret requested to merge fsignoret/kstars:fix-focus-temperature-reset into master

Summary: when starting the autofocus operation, we should not reset the last focus temperature. This is to avoid the situation of having autofocus fail or be aborted, and stay long with no temperature reference for the autofocus on temperature delta feature.

An alternative would have been to just warn the user that we have no successful autofocus at sequence startup. This was discussed and discarded in the following merge request: !7 (closed)

Test plan:

  • connect the focuser simulator
  • check the temperature delta box
  • perform autofocus
  • perform a second autofocus and abort it
  • create and start a sequence
  • increase the temperature in the focuser simulator
  • verify that the autofocus is triggered

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