Dotty

Fix extending protected nested java classes #33009

Job	Run time
test	56m 22s
test_non_bootstrapped	0s
test_scala2_library_tasty	0s
test_windows_fast	40m 33s
community_build_a	50m 23s
community_build_b	1h 23m 33s
community_build_c	59m 31s
MiMa	10m 50s
test_windows_full	0s
build-msi-package	0s
test_java8	0s
test_sbt	17m 46s
build-sdk-package / build	7m 52s
test-msi-package	0s
build-chocolatey-package / build	29s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 27m 19s

Provide feedback