Handle Transpositions More Intelligently

[gflohr]

Currently, the add-on distinguishes notes only by the sequence of moves that lead to a certain position. If another sequence of moves tranposes into the same position, new cards a generated for it.

[gflohr]

Not clear what the best solution is.

The transposition and all moves following it could simply be discarded. But that would also discard comments, annotations, arrows etc. made to it which is maybe not the desired behaviour.

For the time being, you should make that decision explicitely yourself, maybe by adding a comment like "This is the same position after ...", and just stop the variation. Since this is pretty much the same solution as traditional chess literature uses, it may not be a bad idea to just stick to it.