fix bug finding focus in stack with only one slice #162
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Fixing bug related to focus finding in stack with only one slice.
in_focus_index=0
should be returned byfocus_from_transverse_band
, not_check_focus_inputs
._check_focus_inputs
could also be refactored into two functions that 1. check the inputs and 2. determine the correct optimization function. This will remove possible confusion on_check_focus_inputs
returning a callable.