from Xyz import to_text can import extension methods

[JaroslavTulach]

Pull Request Description

• fixes Importing extension methods ignores hiding and ignores methods imported by name (only all works) #10796
• by adding extensive list of new tests
• by checking the name of method to import in onlyNames list

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• All code follows the
  Scala,
  Java,
• Unit tests have been written where possible.

[4e6]

Good overall. I would also add tests verifying that from X import all hiding Y correctly handle conversions

[JaroslavTulach]

Good overall. I would also add tests verifying that from X import all hiding Y correctly handle conversions

Done in 1f88c29 - yet the handling of from imports is far from ideal. But I'd rather leave that for another PR.