The multibyte role short_description causes warning "Title underline too short."

[akira6592]

The multibyte role short_description causes warning "Title underline too short."

argument_specs.yml:

---
argument_specs:
  main:
    short_description: short description of Main entry point for テストロール
    description:
      - description of Main entry point for テストロール
    author:
      - akira6592
    options:
      myapp_int:
        type: "int"
        required: false
        default: 42
        description:
          - "The integer value, defaulting to 42."

% dest/build.sh

...(omit)...
/Users/akira/ansible/dest/rst/collections/local/mycollection/myapp_role.rst:19: WARNING: Title underline too short.

local.mycollection.myapp role -- short description of Main entry point for テストロール
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
/Users/akira/ansible/dest/rst/collections/local/mycollection/myapp_role.rst:41: WARNING: Title underline too short.

Entry point ``main`` -- short description of Main entry point for テストロール
------------------------------------------------------------------------

...(omit)...

It is not only role short_description, but maybe also other short_description.

[felixfontein]

docutils emits that warning when column_width(title) > len(underline), with from docutils.utils import column_width. Instead of recreating column_width, let's simply import it from docutils (which we depend on anyway) and use it instead of len(...) (what we use right now).

[felixfontein]

I created #229 to fix this.

[felixfontein]

antsibull-docs 2.6.1 fixes this.

[akira6592]

@felixfontein
Thanks for the quick fix and release!
I have confirmed that the problem has been fixed in version 2.6.1.