merge revision(s) d6ce4180a5b4dacbac895c9911031a6df6c61136: [Backport #19243]

	Windows: Fix encoding of Dir.home

	Dir.home returns an UTF-8 string since ruby-3.0, but the actual
	encoding of the bytes was CP_ACP or CP_OEMCP.
	That led to invalid bytes when calling Dir.home with an unicode
	username.
	---
	 spec/ruby/core/dir/home_spec.rb | 11 +++++++++++
	 win32/file.c                    |  3 ++-
	 2 files changed, 13 insertions(+), 1 deletion(-)

1 files changed, 11 insertions, 0 deletions

diff --git a/spec/ruby/core/dir/home_spec.rb b/spec/ruby/core/dir/home_spec.rb
index 713ba9db9a..e8c7f5970b 100644
--- a/spec/ruby/core/dir/home_spec.rb
+++ b/spec/ruby/core/dir/home_spec.rb
@@ -19,6 +19,17 @@ describe "Dir.home" do
     it "returns a non-frozen string" do
       Dir.home.should_not.frozen?
     end
+
+    platform_is :windows do
+      ruby_version_is "3.0" do
+        it "returns the home directory with forward slashs and as UTF-8" do
+          ENV['HOME'] = "C:\\rubyspäc\\home"
+          home = Dir.home
+          home.should == "C:/rubyspäc/home"
+          home.encoding.should == Encoding::UTF_8
+        end
+      end
+    end
   end
 
   describe "when called with the current user name" do