Group results with similar signature

[Luegg]

Some queries retrieve result sets with many definitions inherited from the same base trait. E.g. List => Int => Option retrieves List.lift, Seq.lift, etc. Those "duplicated" results do not add much benefit as the most specific (List.lift) is usually the most useful to the user.

To avoid those polluted result sets, results with similar signatures can be grouped in one entry.

E.g. a result set like

• scala.Int.MaxValue: Int
• Enumeration.maxId: Int
• scala.Short.MaxValue: Short
• scala.Byte.MaxValue: Byte
• scala.Char.MaxValue: Char
• scala.math.max(Int, Int): Int

becomes

• scala.Int.MaxValue: Int
  • scala.Short.MaxValue: Short
  • ...
• Enumeration.maxId: Int
  • ...
• scala.math.max(Int, Int): Int
  • ...

[Luegg]

Addressed by 236b303d203ede2edc6f02b82602fca8936f3b01