Before, partial bridges were calculated. For each of these an angle
has been choosen and after that all the bridges have been merged.
Becouse of the merge a single angle had to be picked.
The first angle that the algorithm has stumbled upon has been picked,
resulting in sub-optimal bridging directions.
Now the partial bridges are calcualted, then merged and then
the angle is decided over the whole merged bridge.
This approach at least ensures that the orientation is the best possible
for the merged bridge.
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