Friendly typo checker relies on selections

[som-snytt]

reproduction steps

scala 2.13.2> val hello = "hi there" ; hellx
                                       ^
              error: not found: value hellx

scala 2.13.2> val hello = "hi there" ; this.hellx
                                            ^
              error: value hellx is not a member of $iw
              did you mean hello?

problem

It would be nice to typo check against scope, including locals.

[som-snytt]

-- [E008] Not Found Error: test/files/neg/suggest-similar.scala:16:25 --------------------------------------------------
16 |  import scala.io.StdIn.{readline, readInt}
   |                         ^^^^^^^^
   |value readline is not a member of object scala.io.StdIn - did you mean StdIn.readLine? or perhaps StdIn.readLine?

// compare

suggest-similar.scala:16: error: value readline is not a member of object scala.io.StdIn
did you mean readLine? or perhaps readByte, readInt, or readLong?
  import scala.io.StdIn.{readline, readInt}
         ^

// but dotty is probably trimming the suggestions by length; maybe scala 2 admits too much;
// and scala 2 should not suggest `readInt`, which is already in the clause

Noticed at scala/scala3#18762

Dotty is more nuanced in comparing edit distance to lengths of candidates.