Add hyphens to block template suggestions

Problem/Motivation

I've noticed that when one create a custom block, the twig naming template suggestion is taken from the description of the block. The problem is that spaces are removed. is it possible to replace space to hyphen? I think it's important to make the twig template more readable.

Example:

if i create a custom block with the description "home page section free software". space are removed and the twig template naming suggestion will be:
block--homepagesectionfreesoftware.html.twig

i will be mutch more readable if space are remplaced with "- ", for the twig template naming suggestion to be:
block--home-page-section-free-software.html.twig

Proposed resolution

For now i've found a work around by replacing space with underscore in the block description at the creation. Exemple: if block description "home_page_section_free_software", the template naming suggestion is:
block--home-page-section-free-software.html.twig

I'am also aware of the module "block content machine name" https://www.drupal.org/project/block_content_machine_name → . But i think that feature should be in core. More than that , that module cause several naming problem that i will not expose here.

Remaining tasks

Add change record
Add release note snippet

User interface changes

Machine names are created a bit differently.

API changes

None

Data model changes

None

Release notes snippet

@todo