install_renamed: handle recursive installs.

Closes Homebrew/homebrew#49845.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Library/Homebrew/extend/pathname.rb

@@ -82,6 +82,7 @@ class Pathname
     src = Pathname(src)
     dst = join(new_basename)
     dst = yield(src, dst) if block_given?
+    return unless dst
 
     mkpath
 

Library/Homebrew/install_renamed.rb

@@ -2,7 +2,8 @@ module InstallRenamed
   def install_p(_, new_basename)
     super do |src, dst|
       if src.directory?
-        dst
+        dst.install(src.children)
+        next
       else
         append_default_if_different(src, dst)
       end

Library/Homebrew/test/test_pathname.rb

@@ -137,6 +137,16 @@ class PathnameTests < Homebrew::TestCase
     assert_equal "a", File.read(@dst+@src.basename+@file.basename)
   end
 
+  def test_install_renamed_directory_recursive
+    @dst.extend(InstallRenamed)
+    (@dst+@dir.basename).mkpath
+    (@dst+@dir.basename+"another_file").write "a"
+    @dir.mkpath
+    (@dir+"another_file").write "b"
+    @dst.install @dir
+    assert_equal "b", File.read(@dst+@dir.basename+"another_file.default")
+  end
+
   def test_cp_path_sub_file
     @file.write "a"
     @file.cp_path_sub @src, @dst