MC does not set group-sticky bit when copy directory to directory with group-sticky bit

[math_coder]

Steps to reproduce:

1. Ensure you have two user groups in system ("users" and "some_user", for example), and test user is included in both.
2. Create directory "source" owned by test user, "some_user" group.
3. Create directory "target" owned by test user, "users" group.
4. Set group-sticky bit for "target" directory: chmod g+s target
5. Copy "source" directory to "target" directory with MC (with or without "Preserve attributes" flag).
6. Check ownership and mode of copied directory:

~$ ls -ld target/source

Actual result:
Copied directory is owned by "users" group but does not have group-sticky bit. (The result does not depend of "Preserve attributes" flag.)

Expected result:
Copied directory is owned by "users" group but and has group-sticky bit. (The result should not depend of "Preserve attributes" flag.)

[math_coder]

Fix, which I use as temporary solution