Scala 3 range selection follow up

[Quafadas]

Describe the bug

This PR #6485 started with the grand aim, of addressing #6568, #6485 ultimately took only the first step as a blind back port from the scala 3 presentation compiler. I don't believe the compiler implementation to be perfect - this test fails;

  check(
    "def - braced",
    """object Main extends App { def foo(hi: Int, b@@: Int, c:Int) = ??? } """.stripMargin,
    List(),
    Map(
      "3" -> List(
        """object Main extends App { def foo(hi: Int, >>region>>b: Int<<region<<, c:Int) = ??? }""".stripMargin,
        """object Main extends App { def foo(>>region>>hi: Int, b: Int, c:Int<<region<<) = ??? }""".stripMargin,
        """object Main extends App { >>region>>def foo(hi: Int, b: Int, c:Int) = ???<<region<< }""".stripMargin,
        /* These fail. A perfect implemenation would succeed (I believe). The effort / fix value ratio means we leave it as is for now */
        """object Main extends >>region>>App { def foo(hi: Int, b: Int, c:Int) = ??? }<<region<<""".stripMargin,
        """>>region>>object Main extends App { def foo(hi: Int, b: Int, c:Int) = ??? }<<region<<""".stripMargin
      )
    )
  )

Where I believe it should succeed. Should #6485 get merged, it will be without the lines below the comment. It is left as such as the effort / value ratio is rather high, but recorded here for posterity.

Expected behavior

The test in def -braced test in SelectionRangeSuite.scala should pass with the extra lines above.

Operating system

macOS

Editor/Extension

VS Code

Version of Metals

v.1.3.2

Extra context or search terms

No response