* fix rebundant leading spaces in markdown list * add test for rebundant leading spaces in markdown_list * add changelog_unreleased file of pr-7178 * Update changelog_unreleased/markdown/pr-7178.md Co-Authored-By: Sosuke Suzuki <aosukeke@gmail.com> * Update changelog_unreleased/markdown/pr-7178.md Co-Authored-By: Sosuke Suzuki <aosukeke@gmail.com> * fix minor issues Co-authored-by: Sosuke Suzuki <aosukeke@gmail.com> Co-authored-by: Georgii Dolzhykov <thorn.mailbox@gmail.com>