markdown-mode-2.3 has been released in 2017-08-31. Currently the Gentoo repository is stuck with version 2.1.
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=1ce76267d12e2837c7768d9ea19fd7bd797cb1f1 commit 1ce76267d12e2837c7768d9ea19fd7bd797cb1f1 Author: Naohiro Aota <naota@gentoo.org> AuthorDate: 2018-02-26 07:26:46 +0000 Commit: Naohiro Aota <naota@gentoo.org> CommitDate: 2018-02-26 07:31:40 +0000 app-emacs/markdown-mode: version bump Bug: https://bugs.gentoo.org/647846 Package-Manager: Portage-2.3.24, Repoman-2.3.6 app-emacs/markdown-mode/Manifest | 1 + app-emacs/markdown-mode/markdown-mode-2.3.ebuild | 24 ++++++++++++++++++++++++ 2 files changed, 25 insertions(+)}
Thanks for reporting.