Missing Context bound completions in extension constructs

[rochala]

Compiler version

3.4.1

Minimized code

  // file dotty/tools/pc/tests/completion/CompletionSuite.scala
  @Test def `context-bound-in-extension` =
    check(
      """
        |object x {
        |  extension [T: Orde@@]
        |}
        |""".stripMargin,
      "Ordering scala.math.Ordering"
    )

Output

No completions are available in this scenario

Expectation

Ordering should be properly completed in this situation.

Tips

The root cause of this problem is in interactive.Completion.scala which has a special way to handle the extension defs, as after desugaring, there is no trace of this definition in typed trees.
It is probably happening when decision whether to use typed or untyped path happens, or at adjustedPath creation site.