Scaladoc shows shadowed overloaded signatures

[som-snytt]

Compiler version

3.6

Problem

immutable.SortedSet has an overloaded map method, but only one alternative is API.

It would be nice to filter out alternatives which are not selectable. (ss.map errors if the implicit search fails.)

Expectation

Only show the method I can invoke on the given class as receiver type.

Noticed at scala/scala#10218 (comment)