git-remote-mediawiki: fix encoding issue for UTF-8 media files

When a media file contains valid UTF-8, git-remote-mediawiki tried to be
too clever about the encoding, and the call to utf8::downgrade() on the
downloaded content was failing with

  Wide character in subroutine entry at git-remote-mediawiki line 583.

Instead, use $response->decode() to apply decoding linked to the
Content-Encoding: header, and return the content without attempting any
charset decoding.
Signed-off-by: NMatthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

contrib/mw-to-git/git-remote-mediawiki.perl

@@ -461,7 +461,12 @@ sub download_mw_mediafile {
 
 	my $response = $mediawiki->{ua}->get($download_url);
 	if ($response->code == HTTP_CODE_OK) {
-		return $response->decoded_content;
+		# It is tempting to return
+		# $response->decoded_content({charset => "none"}), but
+		# when doing so, utf8::downgrade($content) fails with
+		# "Wide character in subroutine entry".
+		$response->decode();
+		return $response->content();
 	} else {
 		print {*STDERR} "Error downloading mediafile from :\n";
 		print {*STDERR} "URL: ${download_url}\n";

contrib/mw-to-git/t/t9363-mw-to-git-export-import.sh

@@ -58,6 +58,25 @@ test_expect_success 'git clone works on previously created wiki with media files
 	test_cmp mw_dir_clone/Foo.txt mw_dir/Foo.txt
 '
 
+test_expect_success 'git push can upload media (File:) files containing valid UTF-8' '
+	wiki_reset &&
+	git clone mediawiki::'"$WIKI_URL"' mw_dir &&
+	(
+		cd mw_dir &&
+		"$PERL_PATH" -e "print STDOUT \"UTF-8 content: éèàéê€.\";" >Bar.txt &&
+		git add Bar.txt &&
+		git commit -m "add a text file with UTF-8 content" &&
+		git push
+	)
+'
+
+test_expect_success 'git clone works on previously created wiki with media files containing valid UTF-8' '
+	test_when_finished "rm -rf mw_dir mw_dir_clone" &&
+	git clone -c remote.origin.mediaimport=true \
+		mediawiki::'"$WIKI_URL"' mw_dir_clone &&
+	test_cmp mw_dir_clone/Bar.txt mw_dir/Bar.txt
+'
+
 test_expect_success 'git push & pull work with locally renamed media files' '
 	wiki_reset &&
 	git clone mediawiki::'"$WIKI_URL"' mw_dir &&