This is a followup to 1345ed9214 which caused a regression in that not
the "real" closest distance was chosen.
The "real" closest distance should be based on the closest selected
item, but instead, it was now more or less based on the _last_ selected
item, so seemingly the whole influence-thing was shifted to the right...
Since we were not applying the closest distance directly (but
postponing), we continued iterating and the min_ff call was not taking
into account the "stored" value.
So to resolve, additionally min_ff the "stored" value as well.
Pull Request: https://projects.blender.org/blender/blender/pulls/140209
cd43760843