%span.str-truncated
  = link_to_html commit.redacted_full_title_html, project_commit_path(@project, commit.id), title: commit.redacted_full_title_html, class: 'tree-commit-link'

- full_title = markdown_field(commit, :full_title)
%span.str-truncated
  = link_to_html full_title, project_commit_path(@project, commit.id), title: full_title, class: 'tree-commit-link'

Use markdown_field helper to display full_title
Use markdown_field helper to display full_title
